1 /* 2 * Copyright (c) 2000, 2017, 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 /** Printing used during stack dumps */ 76 public void printLockInfo(PrintStream tty, int frameCount) { 77 // If this is the first frame and it is java.lang.Object.wait(...) 78 // then print out the receiver. Locals are not always available, 79 // e.g., compiled native frames have no scope so there are no locals. 80 if (frameCount == 0) { 81 if (getMethod().getName().asString().equals("wait") && 82 getMethod().getMethodHolder().getName().asString().equals("java/lang/Object")) { 83 String waitState = "waiting on"; // assume we are waiting 84 // If earlier in the output we reported java.lang.Thread.State == 85 // "WAITING (on object monitor)" and now we report "waiting on", then 86 // we are still waiting for notification or timeout. Otherwise if 87 // we earlier reported java.lang.Thread.State == "BLOCKED (on object 88 // monitor)", then we are actually waiting to re-lock the monitor. 89 // At this level we can't distinguish the two cases to report 90 // "waited on" rather than "waiting on" for the second case. 91 StackValueCollection locs = getLocals(); 92 if (!locs.isEmpty()) { 93 StackValue sv = locs.get(0); 94 if (sv.getType() == BasicType.getTObject()) { 95 OopHandle o = sv.getObject(); 96 printLockedObjectClassName(tty, o, waitState); 97 } 98 } else { 99 tty.println("\t- " + waitState + " <no object reference available>"); 100 } 101 } else if (thread.getCurrentParkBlocker() != null) { 102 Oop obj = thread.getCurrentParkBlocker(); 103 Klass k = obj.getKlass(); 104 tty.format("\t- parking to wait for <" + ADDRESS_FORMAT + "> (a %s)", 105 obj.getHandle().asLongValue(), k.getName().asString()); 106 tty.println(); 107 } 108 } 109 110 // Print out all monitors that we have locked, or are trying to lock, 111 // including re-locking after being notified or timing out in a wait(). 112 List<MonitorInfo> mons = getMonitors(); 113 if (!mons.isEmpty()) { 114 boolean foundFirstMonitor = false; 115 for (int index = mons.size() - 1; index >= 0; index--) { 116 MonitorInfo monitor = mons.get(index); 117 if (monitor.eliminated() && isCompiledFrame()) { // Eliminated in compiled code 118 if (monitor.ownerIsScalarReplaced()) { 119 Klass k = Oop.getKlassForOopHandle(monitor.ownerKlass()); 120 tty.println("\t- eliminated <owner is scalar replaced> (a " + k.getName().asString() + ")"); 121 } else if (monitor.owner() != null) { 122 printLockedObjectClassName(tty, monitor.owner(), "eliminated"); 123 } 124 continue; 125 } 126 if (monitor.owner() != null) { 127 // the monitor is associated with an object, i.e., it is locked 128 129 Mark mark = null; 130 String lockState = "locked"; 131 if (!foundFirstMonitor && frameCount == 0) { 132 // If this is the first frame and we haven't found an owned 133 // monitor before, then we need to see if we have completed 134 // the lock or if we are blocked trying to acquire it. Only 135 // an inflated monitor that is first on the monitor list in 136 // the first frame can block us on a monitor enter. 137 mark = new Mark(monitor.owner()); 138 if (mark.hasMonitor() && 139 ( // we have marked ourself as pending on this monitor 140 mark.monitor().equals(thread.getCurrentPendingMonitor()) || 141 // we are not the owner of this monitor 142 !mark.monitor().isEntered(thread) 143 )) { 144 lockState = "waiting to lock"; 145 } else { 146 // We own the monitor which is not as interesting so 147 // disable the extra printing below. 148 mark = null; 149 } 150 } else if (frameCount != 0) { 151 // This is not the first frame so we either own this monitor 152 // or we owned the monitor before and called wait(). Because 153 // wait() could have been called on any monitor in a lower 154 // numbered frame on the stack, we have to check all the 155 // monitors on the list for this frame. 156 mark = new Mark(monitor.owner()); 157 if (mark.hasMonitor() && 158 ( // we have marked ourself as pending on this monitor 159 mark.monitor().equals(thread.getCurrentPendingMonitor()) || 160 // we are not the owner of this monitor 161 !mark.monitor().isEntered(thread) 162 )) { 163 lockState = "waiting to re-lock in wait()"; 164 } else { 165 // We own the monitor which is not as interesting so 166 // disable the extra printing below. 167 mark = null; 168 } 169 } 170 printLockedObjectClassName(tty, monitor.owner(), lockState); 171 foundFirstMonitor = true; 172 } 173 } 174 } 175 } 176 177 /** Printing operations */ 178 179 // 180 // FIXME: implement visitor pattern for traversing vframe contents? 181 // 182 183 public void print() { 184 printOn(System.out); 185 } 186 187 public void printOn(PrintStream tty) { 188 super.printOn(tty); 189 190 tty.print("\t"); 191 getMethod().printValueOn(tty); 192 tty.println(); 193 tty.println("\tbci:\t" + getBCI()); 194 195 printStackValuesOn(tty, "locals", getLocals()); 196 printStackValuesOn(tty, "expressions", getExpressions()); 197 198 // List<MonitorInfo> 199 // FIXME: not yet implemented 200 // List list = getMonitors(); 201 // if (list.isEmpty()) { 202 // return; 203 // } 204 // for (int index = 0; index < list.size(); index++) { 205 // MonitorInfo monitor = (MonitorInfo) list.get(index); 206 // tty.print("\t obj\t"); 207 // monitor.getOwner().printValueOn(tty); 208 // tty.println(); 209 // tty.print("\t "); 210 // monitor.lock().printOn(tty); 211 // tty.println(); 212 // } 213 } 214 215 public void printActivation(int index) { 216 printActivationOn(System.out, index); 217 } 218 219 public void printActivationOn(PrintStream tty, int index) { 220 // frame number and method 221 tty.print(index + " - "); 222 printValueOn(tty); 223 tty.println(); 224 225 if (VM.getVM().wizardMode()) { 226 printOn(tty); 227 tty.println(); 228 } 229 } 230 231 /** Verification operations */ 232 public void verify() { 233 } 234 235 public boolean equals(Object o) { 236 if (o == null || !(o instanceof JavaVFrame)) { 237 return false; 238 } 239 240 JavaVFrame other = (JavaVFrame) o; 241 242 // Check static part 243 if (!getMethod().equals(other.getMethod())) { 244 return false; 245 } 246 247 if (getBCI() != other.getBCI()) { 248 return false; 249 } 250 251 // dynamic part - we just compare the frame pointer 252 if (! getFrame().equals(other.getFrame())) { 253 return false; 254 } 255 return true; 256 } 257 258 public int hashCode() { 259 return getMethod().hashCode() ^ getBCI() ^ getFrame().hashCode(); 260 } 261 262 /** Structural compare */ 263 public boolean structuralCompare(JavaVFrame other) { 264 // Check static part 265 if (!getMethod().equals(other.getMethod())) { 266 return false; 267 } 268 269 if (getBCI() != other.getBCI()) { 270 return false; 271 } 272 273 // Check locals 274 StackValueCollection locs = getLocals(); 275 StackValueCollection otherLocs = other.getLocals(); 276 if (Assert.ASSERTS_ENABLED) { 277 Assert.that(locs.size() == otherLocs.size(), "sanity check"); 278 } 279 for (int i = 0; i < locs.size(); i++) { 280 // it might happen the compiler reports a conflict and 281 // the interpreter reports a bogus int. 282 if ( isCompiledFrame() && (locs.get(i)).getType() == BasicType.getTConflict()) continue; 283 if (other.isCompiledFrame() && (otherLocs.get(i)).getType() == BasicType.getTConflict()) continue; 284 285 if (!locs.get(i).equals(otherLocs.get(i))) { 286 return false; 287 } 288 } 289 290 // Check expressions 291 StackValueCollection exprs = getExpressions(); 292 StackValueCollection otherExprs = other.getExpressions(); 293 if (Assert.ASSERTS_ENABLED) { 294 Assert.that(exprs.size() == otherExprs.size(), "sanity check"); 295 } 296 for (int i = 0; i < exprs.size(); i++) { 297 if (!exprs.get(i).equals(otherExprs.get(i))) { 298 return false; 299 } 300 } 301 302 return true; 303 } 304 305 //-------------------------------------------------------------------------------- 306 // Internals only below this point 307 // 308 309 private void printStackValuesOn(PrintStream tty, String title, StackValueCollection values) { 310 if (values.isEmpty()) { 311 return; 312 } 313 tty.println("\t" + title + ":"); 314 for (int index = 0; index < values.size(); index++) { 315 tty.print("\t" + index + "\t"); 316 values.get(index).printOn(tty); 317 tty.println(); 318 } 319 } 320 }