6837472: com/sun/jdi/MonitorFrameInfo.java fails with AggressiveOpts in 6u14

Summary: Disable escape analysis when jvmti/debugger is used. Add support for EA ibto SA.
Reviewed-by: never

agent/src/share/classes/sun/jvm/hotspot/code/DebugInfoReadStream.java

@@ -24,23 +24,64 @@
 
 package sun.jvm.hotspot.code;
 
+import java.util.*;
+
 import sun.jvm.hotspot.debugger.*;
 import sun.jvm.hotspot.runtime.VM;
+import sun.jvm.hotspot.utilities.*;
 
 public class DebugInfoReadStream extends CompressedReadStream {
   private NMethod code;
   private int InvocationEntryBCI;
+  private List objectPool; // ArrayList<ObjectValue>
 
   public DebugInfoReadStream(NMethod code, int offset) {
     super(code.scopesDataBegin(), offset);
     InvocationEntryBCI = VM.getVM().getInvocationEntryBCI();
     this.code = code;
+    this.objectPool = null;
+  }
+
+  public DebugInfoReadStream(NMethod code, int offset, List objectPool) {
+    super(code.scopesDataBegin(), offset);
+    InvocationEntryBCI = VM.getVM().getInvocationEntryBCI();
+    this.code = code;
+    this.objectPool = objectPool;
   }
 
   public OopHandle readOopHandle() {
     return code.getOopAt(readInt());
   }
 
+  ScopeValue readObjectValue() {
+    int id = readInt();
+    if (Assert.ASSERTS_ENABLED) {
+      Assert.that(objectPool != null, "object pool does not exist");
+      for (Iterator itr = objectPool.iterator(); itr.hasNext();) {
+        ObjectValue ov = (ObjectValue) itr.next();
+        Assert.that(ov.id() != id, "should not be read twice");
+      }
+    }
+    ObjectValue result = new ObjectValue(id);
+    // Cache the object since an object field could reference it.
+    objectPool.add(result);
+    result.readObject(this);
+    return result;
+  }
+
+  ScopeValue getCachedObject() {
+    int id = readInt();
+    Assert.that(objectPool != null, "object pool does not exist");
+    for (Iterator itr = objectPool.iterator(); itr.hasNext();) {
+      ObjectValue ov = (ObjectValue) itr.next();
+      if (ov.id() == id) {
+        return ov;
+      }
+    }
+    Assert.that(false, "should not reach here");
+    return null;
+  }
+
   public int readBCI() {
     return readInt() + InvocationEntryBCI;
   }

agent/src/share/classes/sun/jvm/hotspot/code/MonitorValue.java

@@ -29,6 +29,7 @@ import java.io.*;
 public class MonitorValue {
   private ScopeValue owner;
   private Location   basicLock;
+  private boolean    eliminated;
 
   // FIXME: not useful yet
   //  MonitorValue(ScopeValue* owner, Location basic_lock);
@@ -36,10 +37,12 @@ public class MonitorValue {
   public MonitorValue(DebugInfoReadStream stream) {
     basicLock = new Location(stream);
     owner     = ScopeValue.readFrom(stream);
+    eliminated= stream.readBoolean();
   }
 
   public ScopeValue owner()     { return owner; }
   public Location   basicLock() { return basicLock; }
+  public boolean   eliminated() { return eliminated; }
 
   // FIXME: not yet implementable
   //  void write_on(DebugInfoWriteStream* stream);
@@ -50,5 +53,8 @@ public class MonitorValue {
     tty.print(",");
     basicLock().printOn(tty);
     tty.print("}");
+    if (eliminated) {
+      tty.print(" (eliminated)");
+    }
   }
 }

agent/src/share/classes/sun/jvm/hotspot/code/ObjectValue.java

+/*
+ * Copyright 2009 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+package sun.jvm.hotspot.code;
+
+import java.io.*;
+import java.util.*;
+
+import sun.jvm.hotspot.debugger.*;
+import sun.jvm.hotspot.utilities.*;
+
+/** An ObjectValue describes an object eliminated by escape analysis. */
+
+public class ObjectValue extends ScopeValue {
+  private int        id;
+  private ScopeValue klass;
+  private List       fieldsValue; // ArrayList<ScopeValue>
+
+  // Field "boolean visited" is not implemented here since
+  // it is used only a during debug info creation.
+
+  public ObjectValue(int id) {
+    this.id = id;
+    klass   = null;
+    fieldsValue = new ArrayList();
+  }
+
+  public boolean isObject() { return true; }
+  public int id() { return id; }
+  public ScopeValue getKlass() { return klass; }
+  public List getFieldsValue() { return fieldsValue; }
+  public ScopeValue getFieldAt(int i) { return (ScopeValue)fieldsValue.get(i); }
+  public int fieldsSize() { return fieldsValue.size(); }
+
+  // Field "value" is always NULL here since it is used
+  // only during deoptimization of a compiled frame
+  // pointing to reallocated object.
+  public OopHandle getValue() { return null; }
+
+  /** Serialization of debugging information */
+
+  void readObject(DebugInfoReadStream stream) {
+    klass = readFrom(stream);
+    Assert.that(klass.isConstantOop(), "should be constant klass oop");
+    int length = stream.readInt();
+    for (int i = 0; i < length; i++) {
+      ScopeValue val = readFrom(stream);
+      fieldsValue.add(val);
+    }
+  }
+
+  // Printing
+
+  public void print() {
+    printOn(System.out);
+  }
+
+  public void printOn(PrintStream tty) {
+    tty.print("scalarObj[" + id + "]");
+  }
+
+  void printFieldsOn(PrintStream tty) {
+    if (fieldsValue.size() > 0) {
+      ((ScopeValue)fieldsValue.get(0)).printOn(tty);
+    }
+    for (int i = 1; i < fieldsValue.size(); i++) {
+      tty.print(", ");
+      ((ScopeValue)fieldsValue.get(i)).printOn(tty);
+    }
+  }
+
+};

agent/src/share/classes/sun/jvm/hotspot/code/ScopeDesc.java

@@ -27,8 +27,10 @@ package sun.jvm.hotspot.code;
 import java.io.*;
 import java.util.*;
 
+import sun.jvm.hotspot.debugger.*;
 import sun.jvm.hotspot.oops.*;
 import sun.jvm.hotspot.runtime.*;
+import sun.jvm.hotspot.utilities.*;
 
 /** ScopeDescs contain the information that makes source-level
     debugging of nmethods possible; each scopeDesc describes a method
@@ -45,10 +47,31 @@ public class ScopeDesc {
   private int     localsDecodeOffset;
   private int     expressionsDecodeOffset;
   private int     monitorsDecodeOffset;
+  /** Scalar replaced bjects pool */
+  private List    objects; // ArrayList<ScopeValue>
+
 
   public ScopeDesc(NMethod code, int decodeOffset) {
     this.code = code;
     this.decodeOffset = decodeOffset;
+    this.objects      = decodeObjectValues(DebugInformationRecorder.SERIALIZED_NULL);
+
+    // Decode header
+    DebugInfoReadStream stream  = streamAt(decodeOffset);
+
+    senderDecodeOffset = stream.readInt();
+    method = (Method) VM.getVM().getObjectHeap().newOop(stream.readOopHandle());
+    bci    = stream.readBCI();
+    // Decode offsets for body and sender
+    localsDecodeOffset      = stream.readInt();
+    expressionsDecodeOffset = stream.readInt();
+    monitorsDecodeOffset    = stream.readInt();
+  }
+
+  public ScopeDesc(NMethod code, int decodeOffset, int objectDecodeOffset) {
+    this.code = code;
+    this.decodeOffset = decodeOffset;
+    this.objects      = decodeObjectValues(objectDecodeOffset);
 
     // Decode header
     DebugInfoReadStream stream  = streamAt(decodeOffset);
@@ -81,6 +104,11 @@ public class ScopeDesc {
     return decodeMonitorValues(monitorsDecodeOffset);
   }
 
+  /** Returns a List&lt;MonitorValue&gt; */
+  public List getObjects() {
+    return objects;
+  }
+
   /** Stack walking. Returns null if this is the outermost scope. */
   public ScopeDesc sender() {
     if (isTop()) {
@@ -131,7 +159,7 @@ public class ScopeDesc {
   //
 
   private DebugInfoReadStream streamAt(int decodeOffset) {
-    return new DebugInfoReadStream(code, decodeOffset);
+    return new DebugInfoReadStream(code, decodeOffset, objects);
   }
 
   /** Returns a List&lt;ScopeValue&gt; or null if no values were present */
@@ -161,4 +189,22 @@ public class ScopeDesc {
     }
     return res;
   }
+
+  /** Returns a List&lt;ObjectValue&gt; or null if no values were present */
+  private List decodeObjectValues(int decodeOffset) {
+    if (decodeOffset == DebugInformationRecorder.SERIALIZED_NULL) {
+      return null;
+    }
+    List res = new ArrayList();
+    DebugInfoReadStream stream = new DebugInfoReadStream(code, decodeOffset, res);
+    int length = stream.readInt();
+    for (int i = 0; i < length; i++) {
+      // Objects values are pushed to 'res' array during read so that
+      // object's fields could reference it (OBJECT_ID_CODE).
+      ScopeValue.readFrom(stream);
+      // res.add(ScopeValue.readFrom(stream));
+    }
+    Assert.that(res.size() == length, "inconsistent debug information");
+    return res;
+  }
 }

agent/src/share/classes/sun/jvm/hotspot/code/ScopeValue.java

@@ -49,12 +49,15 @@ public abstract class ScopeValue {
   static final int CONSTANT_OOP_CODE    = 2;
   static final int CONSTANT_LONG_CODE   = 3;
   static final int CONSTANT_DOUBLE_CODE = 4;
+  static final int CONSTANT_OBJECT_CODE = 5;
+  static final int CONSTANT_OBJECT_ID_CODE = 6;
 
   public boolean isLocation()       { return false; }
   public boolean isConstantInt()    { return false; }
   public boolean isConstantDouble() { return false; }
   public boolean isConstantLong()   { return false; }
   public boolean isConstantOop()    { return false; }
+  public boolean isObject()         { return false; }
 
   public static ScopeValue readFrom(DebugInfoReadStream stream) {
     switch (stream.readInt()) {
@@ -68,6 +71,10 @@ public abstract class ScopeValue {
       return new ConstantLongValue(stream);
     case CONSTANT_DOUBLE_CODE:
       return new ConstantDoubleValue(stream);
+    case CONSTANT_OBJECT_CODE:
+      return stream.readObjectValue();
+    case CONSTANT_OBJECT_ID_CODE:
+      return stream.getCachedObject();
     default:
       Assert.that(false, "should not reach here");
       return null;

agent/src/share/classes/sun/jvm/hotspot/jdi/ObjectReferenceImpl.java

@@ -249,6 +249,7 @@ public class ObjectReferenceImpl extends ValueImpl implements ObjectReference {
             OopHandle givenHandle = obj.getHandle();
             for (Iterator itr = monitors.iterator(); itr.hasNext();) {
                 MonitorInfo mi = (MonitorInfo) itr.next();
+                if (mi.eliminated() && frame.isCompiledFrame()) continue; // skip eliminated monitor
                 if (givenHandle.equals(mi.owner())) {
                     res++;
                 }

agent/src/share/classes/sun/jvm/hotspot/jdi/ThreadReferenceImpl.java

@@ -301,6 +301,9 @@ public class ThreadReferenceImpl extends ObjectReferenceImpl
             List frameMonitors = frame.getMonitors();  // List<MonitorInfo>
             for (Iterator miItr = frameMonitors.iterator(); miItr.hasNext(); ) {
                 sun.jvm.hotspot.runtime.MonitorInfo mi = (sun.jvm.hotspot.runtime.MonitorInfo) miItr.next();
+                if (mi.eliminated() && frame.isCompiledFrame()) {
+                  continue; // skip eliminated monitor
+                }
                 OopHandle obj = mi.owner();
                 if (obj == null) {
                     // this monitor doesn't have an owning object so skip it

agent/src/share/classes/sun/jvm/hotspot/runtime/CompiledVFrame.java

@@ -131,8 +131,18 @@ public class CompiledVFrame extends JavaVFrame {
     List result = new ArrayList(monitors.size());
     for (int i = 0; i < monitors.size(); i++) {
       MonitorValue mv = (MonitorValue) monitors.get(i);
-      StackValue ownerSV = createStackValue(mv.owner()); // it is an oop
-      result.add(new MonitorInfo(ownerSV.getObject(), resolveMonitorLock(mv.basicLock())));
+      ScopeValue ov = mv.owner();
+      StackValue ownerSV = createStackValue(ov); // it is an oop
+      if (ov.isObject()) { // The owner object was scalar replaced
+        Assert.that(mv.eliminated() && ownerSV.objIsScalarReplaced(), "monitor should be eliminated for scalar replaced object");
+        // Put klass for scalar replaced object.
+        ScopeValue kv = ((ObjectValue)ov).getKlass();
+        Assert.that(kv.isConstantOop(), "klass should be oop constant for scalar replaced object");
+        OopHandle k = ((ConstantOopReadValue)kv).getValue();
+        result.add(new MonitorInfo(k, resolveMonitorLock(mv.basicLock()), mv.eliminated(), true));
+      } else {
+        result.add(new MonitorInfo(ownerSV.getObject(), resolveMonitorLock(mv.basicLock()), mv.eliminated(), false));
+      }
     }
     return result;
   }
@@ -212,12 +222,12 @@ public class CompiledVFrame extends JavaVFrame {
           // long or is unused.  He always saves a long.  Here we know
           // a long was saved, but we only want an narrow oop back.  Narrow the
           // saved long to the narrow oop that the JVM wants.
-          return new StackValue(valueAddr.getCompOopHandleAt(VM.getVM().getIntSize()));
+          return new StackValue(valueAddr.getCompOopHandleAt(VM.getVM().getIntSize()), 0);
         } else {
-          return new StackValue(valueAddr.getCompOopHandleAt(0));
+          return new StackValue(valueAddr.getCompOopHandleAt(0), 0);
         }
       } else if( loc.holdsOop() ) {  // Holds an oop?
-        return new StackValue(valueAddr.getOopHandleAt(0));
+        return new StackValue(valueAddr.getOopHandleAt(0), 0);
       } else if( loc.holdsDouble() ) {
         // Double value in a single stack slot
         return new StackValue(valueAddr.getJIntAt(0) & 0xFFFFFFFF);
@@ -277,7 +287,7 @@ public class CompiledVFrame extends JavaVFrame {
       return new StackValue(((ConstantIntValue) sv).getValue() & 0xFFFFFFFF);
     } else if (sv.isConstantOop()) {
       // constant oop
-      return new StackValue(((ConstantOopReadValue) sv).getValue());
+      return new StackValue(((ConstantOopReadValue) sv).getValue(), 0);
     } else if (sv.isConstantDouble()) {
       // Constant double in a single stack slot
       double d = ((ConstantDoubleValue) sv).getValue();
@@ -285,6 +295,9 @@ public class CompiledVFrame extends JavaVFrame {
     } else if (VM.getVM().isLP64() && sv.isConstantLong()) {
       // Constant long in a single stack slot
       return new StackValue(((ConstantLongValue) sv).getValue() & 0xFFFFFFFF);
+    } else if (sv.isObject()) {
+      // Scalar replaced object in compiled frame
+      return new StackValue(((ObjectValue)sv).getValue(), 1);
     }
 
     // Unknown ScopeValue type

agent/src/share/classes/sun/jvm/hotspot/runtime/InterpretedVFrame.java

@@ -61,7 +61,7 @@ public class InterpretedVFrame extends JavaVFrame {
       StackValue sv;
       if (oopMask.isOop(i)) {
         // oop value
-        sv = new StackValue(addr.getOopHandleAt(0));
+        sv = new StackValue(addr.getOopHandleAt(0), 0);
       } else {
         // integer
         // Fetch a signed integer the size of a stack slot
@@ -95,7 +95,7 @@ public class InterpretedVFrame extends JavaVFrame {
       StackValue sv;
       if (oopMask.isOop(i + nofLocals)) {
         // oop value
-        sv = new StackValue(addr.getOopHandleAt(0));
+        sv = new StackValue(addr.getOopHandleAt(0), 0);
       } else {
         // integer
         // Fetch a signed integer the size of a stack slot
@@ -113,7 +113,7 @@ public class InterpretedVFrame extends JavaVFrame {
     for (BasicObjectLock current = getFrame().interpreterFrameMonitorEnd();
          current.address().lessThan(getFrame().interpreterFrameMonitorBegin().address());
          current = getFrame().nextMonitorInInterpreterFrame(current)) {
-      result.add(new MonitorInfo(current.obj(), current.lock()));
+      result.add(new MonitorInfo(current.obj(), current.lock(), false, false));
     }
     return result;
   }

agent/src/share/classes/sun/jvm/hotspot/runtime/MonitorInfo.java

@@ -25,16 +25,39 @@
 package sun.jvm.hotspot.runtime;
 
 import sun.jvm.hotspot.debugger.*;
+import sun.jvm.hotspot.utilities.*;
 
 public class MonitorInfo {
   private OopHandle owner;
   private BasicLock lock;
+  private OopHandle ownerKlass;
+  private boolean eliminated;
+  private boolean ownerIsScalarReplaced;
 
-  public MonitorInfo(OopHandle owner, BasicLock lock) {
-    this.owner = owner;
-    this.lock  = lock;
+  public MonitorInfo(OopHandle owner, BasicLock lock, boolean eliminated, boolean ownerIsScalarReplaced) {
+    if (!ownerIsScalarReplaced) {
+      this.owner = owner;
+      this.ownerKlass = null;
+    } else {
+      Assert.that(eliminated, "monitor should be eliminated for scalar replaced object");
+      this.owner = null;
+      this.ownerKlass = owner;
+    }
+    this.eliminated = eliminated;
+    this.ownerIsScalarReplaced = ownerIsScalarReplaced;
+  }
+
+  public OopHandle owner() {
+   Assert.that(!ownerIsScalarReplaced, "should not be called for scalar replaced object");
+   return owner;
+  }
+
+  public OopHandle ownerKlass() {
+   Assert.that(ownerIsScalarReplaced, "should not be called for not scalar replaced object");
+   return ownerKlass;
   }
 
-  public OopHandle owner() { return owner; }
   public BasicLock lock()  { return lock; }
+  public boolean eliminated() { return eliminated; }
+  public boolean ownerIsScalarReplaced() { return ownerIsScalarReplaced; }
 }

agent/src/share/classes/sun/jvm/hotspot/runtime/StackValue.java

@@ -37,9 +37,11 @@ public class StackValue {
     type = BasicType.getTConflict();
   }
 
-  public StackValue(OopHandle h) {
+  public StackValue(OopHandle h, long scalar_replaced) {
     handleValue = h;
     type = BasicType.getTObject();
+    integerValue = scalar_replaced;
+    Assert.that(integerValue == 0 || handleValue == null, "not null object should not be marked as scalar replaced");
   }
 
   public StackValue(long i) {
@@ -59,6 +61,13 @@ public class StackValue {
     return handleValue;
   }
 
+  boolean objIsScalarReplaced() {
+    if (Assert.ASSERTS_ENABLED) {
+      Assert.that(type == BasicType.getTObject(), "type check");
+    }
+    return integerValue != 0;
+  }
+
   public long getInteger() {
     if (Assert.ASSERTS_ENABLED) {
       Assert.that(type == BasicType.getTInt(), "type check");

agent/src/share/classes/sun/jvm/hotspot/utilities/soql/JSJavaThread.java

@@ -135,6 +135,10 @@ public class JSJavaThread extends JSJavaInstance {
                     List frameMonitors = frame.getMonitors();  // List<MonitorInfo>
                     for (Iterator miItr = frameMonitors.iterator(); miItr.hasNext(); ) {
                         MonitorInfo mi = (MonitorInfo) miItr.next();
+
+                        if (mi.eliminated() && frame.isCompiledFrame()) {
+                          continue; // skip eliminated monitor
+                        }
                         OopHandle obj = mi.owner();
                         if (obj == null) {
                             // this monitor doesn't have an owning object so skip it

src/share/vm/opto/c2compiler.cpp

@@ -104,7 +104,9 @@ void C2Compiler::compile_method(ciEnv* env,
     initialize();
   }
   bool subsume_loads = true;
-  bool do_escape_analysis = DoEscapeAnalysis;
+  bool do_escape_analysis = DoEscapeAnalysis &&
+                            !(env->jvmti_can_hotswap_or_post_breakpoint() ||
+                              env->jvmti_can_examine_or_deopt_anywhere());
   while (!env->failing()) {
     // Attempt to compile while subsuming loads into machine instructions.
     Compile C(env, this, target, entry_bci, subsume_loads, do_escape_analysis);

src/share/vm/prims/jvmtiEnvBase.cpp

@@ -606,6 +606,7 @@ JvmtiEnvBase::count_locked_objects(JavaThread *java_thread, Handle hobj) {
     if (!mons->is_empty()) {
       for (int i = 0; i < mons->length(); i++) {
         MonitorInfo *mi = mons->at(i);
+        if (mi->owner_is_scalar_replaced()) continue;
 
         // see if owner of the monitor is our object
         if (mi->owner() != NULL && mi->owner() == hobj()) {
@@ -726,6 +727,8 @@ JvmtiEnvBase::get_locked_objects_in_frame(JavaThread* calling_thread, JavaThread
   for (int i = 0; i < mons->length(); i++) {
     MonitorInfo *mi = mons->at(i);
 
+    if (mi->owner_is_scalar_replaced()) continue;
+
     oop obj = mi->owner();
     if (obj == NULL) {
       // this monitor doesn't have an owning object so skip it

src/share/vm/runtime/biasedLocking.cpp

@@ -121,6 +121,7 @@ static GrowableArray<MonitorInfo*>* get_or_compute_monitor_info(JavaThread* thre
         // Walk monitors youngest to oldest
         for (int i = len - 1; i >= 0; i--) {
           MonitorInfo* mon_info = monitors->at(i);
+          if (mon_info->owner_is_scalar_replaced()) continue;
           oop owner = mon_info->owner();
           if (owner != NULL) {
             info->append(mon_info);
@@ -694,6 +695,7 @@ void BiasedLocking::preserve_marks() {
           // Walk monitors youngest to oldest
           for (int i = len - 1; i >= 0; i--) {
             MonitorInfo* mon_info = monitors->at(i);
+            if (mon_info->owner_is_scalar_replaced()) continue;
             oop owner = mon_info->owner();
             if (owner != NULL) {
               markOop mark = owner->mark();

src/share/vm/runtime/deoptimization.cpp

@@ -933,7 +933,7 @@ static void collect_monitors(compiledVFrame* cvf, GrowableArray<Handle>* objects
   GrowableArray<MonitorInfo*>* monitors = cvf->monitors();
   for (int i = 0; i < monitors->length(); i++) {
     MonitorInfo* mon_info = monitors->at(i);
-    if (mon_info->owner() != NULL && !mon_info->eliminated()) {
+    if (!mon_info->eliminated() && mon_info->owner() != NULL) {
       objects_to_revoke->append(Handle(mon_info->owner()));
     }
   }

src/share/vm/runtime/stackValue.cpp

@@ -146,8 +146,9 @@ StackValue* StackValue::create_stack_value(const frame* fr, const RegisterMap* r
     value.jl = ((ConstantLongValue *)sv)->value();
     return new StackValue(value.p);
 #endif
-  } else if (sv->is_object()) {
-    return new StackValue(((ObjectValue *)sv)->value());
+  } else if (sv->is_object()) { // Scalar replaced object in compiled frame
+    Handle ov = ((ObjectValue *)sv)->value();
+    return new StackValue(ov, (ov.is_null()) ? 1 : 0);
   }
 
   // Unknown ScopeValue type

src/share/vm/runtime/stackValue.hpp

@@ -34,9 +34,11 @@ class StackValue : public ResourceObj {
     _i     = value;
   }
 
-  StackValue(Handle value) {
+  StackValue(Handle value, intptr_t scalar_replaced = 0) {
     _type    = T_OBJECT;
+    _i       = scalar_replaced;
     _o       = value;
+    assert(_i == 0 || _o.is_null(), "not null object should not be marked as scalar replaced");
   }
 
   StackValue() {
@@ -56,6 +58,11 @@ class StackValue : public ResourceObj {
     return _o;
   }
 
+  bool obj_is_scalar_replaced() const {
+    assert(type() == T_OBJECT, "type check");
+    return _i != 0;
+  }
+
   void set_obj(Handle value) {
     assert(type() == T_OBJECT, "type check");
     _o = value;

src/share/vm/runtime/vframe.cpp

@@ -106,6 +106,7 @@ GrowableArray<MonitorInfo*>* javaVFrame::locked_monitors() {
 
   for (int index = (mons->length()-1); index >= 0; index--) {
     MonitorInfo* monitor = mons->at(index);
+    if (monitor->eliminated() && is_compiled_frame()) continue; // skip eliminated monitor
     oop obj = monitor->owner();
     if (obj == NULL) continue; // skip unowned monitor
     //
@@ -162,6 +163,18 @@ void javaVFrame::print_lock_info_on(outputStream* st, int frame_count) {
     bool found_first_monitor = false;
     for (int index = (mons->length()-1); index >= 0; index--) {
       MonitorInfo* monitor = mons->at(index);
+      if (monitor->eliminated() && is_compiled_frame()) { // Eliminated in compiled code
+        if (monitor->owner_is_scalar_replaced()) {
+          Klass* k = Klass::cast(monitor->owner_klass());
+          st->print("\t- eliminated <owner is scalar replaced> (a %s)", k->external_name());
+        } else {
+          oop obj = monitor->owner();
+          if (obj != NULL) {
+            print_locked_object_class_name(st, obj, "eliminated");
+          }
+        }
+        continue;
+      }
       if (monitor->owner() != NULL) {
 
         // First, assume we have the monitor locked. If we haven't found an
@@ -171,11 +184,11 @@ void javaVFrame::print_lock_info_on(outputStream* st, int frame_count) {
 
         const char *lock_state = "locked"; // assume we have the monitor locked
         if (!found_first_monitor && frame_count == 0) {
-         markOop mark = monitor->owner()->mark();
-         if (mark->has_monitor() &&
-             mark->monitor() == thread()->current_pending_monitor()) {
+          markOop mark = monitor->owner()->mark();
+          if (mark->has_monitor() &&
+              mark->monitor() == thread()->current_pending_monitor()) {
             lock_state = "waiting to lock";
-         }
+          }
         }
 
         found_first_monitor = true;
@@ -206,7 +219,7 @@ GrowableArray<MonitorInfo*>* interpretedVFrame::monitors() const {
   for (BasicObjectLock* current = (fr().previous_monitor_in_interpreter_frame(fr().interpreter_frame_monitor_begin()));
        current >= fr().interpreter_frame_monitor_end();
        current = fr().previous_monitor_in_interpreter_frame(current)) {
-    result->push(new MonitorInfo(current->obj(), current->lock(), false));
+    result->push(new MonitorInfo(current->obj(), current->lock(), false, false));
   }
   return result;
 }
@@ -531,8 +544,18 @@ void javaVFrame::print() {
   tty->print_cr("\tmonitor list:");
   for (int index = (list->length()-1); index >= 0; index--) {
     MonitorInfo* monitor = list->at(index);
-    tty->print("\t  obj\t"); monitor->owner()->print_value();
-    tty->print("(" INTPTR_FORMAT ")", (address)monitor->owner());
+    tty->print("\t  obj\t");
+    if (monitor->owner_is_scalar_replaced()) {
+      Klass* k = Klass::cast(monitor->owner_klass());
+      tty->print("( is scalar replaced %s)", k->external_name());
+    } else if (monitor->owner() == NULL) {
+      tty->print("( null )");
+    } else {
+      monitor->owner()->print_value();
+      tty->print("(" INTPTR_FORMAT ")", (address)monitor->owner());
+    }
+    if (monitor->eliminated() && is_compiled_frame())
+      tty->print(" ( lock is eliminated )");
     tty->cr();
     tty->print("\t  ");
     monitor->lock()->print_on(tty);

src/share/vm/runtime/vframe.hpp

@@ -230,18 +230,36 @@ class MonitorInfo : public ResourceObj {
  private:
   oop        _owner; // the object owning the monitor
   BasicLock* _lock;
+  oop        _owner_klass; // klass if owner was scalar replaced
   bool       _eliminated;
+  bool       _owner_is_scalar_replaced;
  public:
   // Constructor
-  MonitorInfo(oop owner, BasicLock* lock, bool eliminated) {
-    _owner = owner;
+  MonitorInfo(oop owner, BasicLock* lock, bool eliminated, bool owner_is_scalar_replaced) {
+    if (!owner_is_scalar_replaced) {
+      _owner = owner;
+      _owner_klass = NULL;
+    } else {
+      assert(eliminated, "monitor should be eliminated for scalar replaced object");
+      _owner = NULL;
+      _owner_klass = owner;
+    }
     _lock  = lock;
     _eliminated = eliminated;
+    _owner_is_scalar_replaced = owner_is_scalar_replaced;
   }
   // Accessors
-  oop        owner() const { return _owner; }
+  oop        owner() const {
+    assert(!_owner_is_scalar_replaced, "should not be called for scalar replaced object");
+    return _owner;
+  }
+  klassOop   owner_klass() const {
+    assert(_owner_is_scalar_replaced, "should not be called for not scalar replaced object");
+    return (klassOop)_owner_klass;
+  }
   BasicLock* lock()  const { return _lock;  }
   bool eliminated()  const { return _eliminated; }
+  bool owner_is_scalar_replaced()  const { return _owner_is_scalar_replaced; }
 };
 
 class vframeStreamCommon : StackObj {

src/share/vm/runtime/vframeArray.cpp

@@ -61,6 +61,7 @@ void vframeArrayElement::fill_in(compiledVFrame* vf) {
     // Migrate the BasicLocks from the stack to the monitor chunk
     for (index = 0; index < list->length(); index++) {
       MonitorInfo* monitor = list->at(index);
+      assert(!monitor->owner_is_scalar_replaced(), "object should be reallocated already");
       assert(monitor->owner() == NULL || (!monitor->owner()->is_unlocked() && !monitor->owner()->has_bias_pattern()), "object must be null or locked, and unbiased");
       BasicObjectLock* dest = _monitors->at(index);
       dest->set_obj(monitor->owner());
@@ -89,6 +90,7 @@ void vframeArrayElement::fill_in(compiledVFrame* vf) {
     StackValue* value = locs->at(index);
     switch(value->type()) {
       case T_OBJECT:
+        assert(!value->obj_is_scalar_replaced(), "object should be reallocated already");
         // preserve object type
         _locals->add( new StackValue((intptr_t) (value->get_obj()()), T_OBJECT ));
         break;
@@ -113,6 +115,7 @@ void vframeArrayElement::fill_in(compiledVFrame* vf) {
     StackValue* value = exprs->at(index);
     switch(value->type()) {
       case T_OBJECT:
+        assert(!value->obj_is_scalar_replaced(), "object should be reallocated already");
         // preserve object type
         _expressions->add( new StackValue((intptr_t) (value->get_obj()()), T_OBJECT ));
         break;

src/share/vm/runtime/vframe_hp.cpp

@@ -190,7 +190,7 @@ GrowableArray<MonitorInfo*>* compiledVFrame::monitors() const {
     // Casting away const
     frame& fr = (frame&) _fr;
     MonitorInfo* info = new MonitorInfo(fr.compiled_synchronized_native_monitor_owner(nm),
-                                        fr.compiled_synchronized_native_monitor(nm), false);
+                                        fr.compiled_synchronized_native_monitor(nm), false, false);
     monitors->push(info);
     return monitors;
   }
@@ -201,8 +201,20 @@ GrowableArray<MonitorInfo*>* compiledVFrame::monitors() const {
   GrowableArray<MonitorInfo*>* result = new GrowableArray<MonitorInfo*>(monitors->length());
   for (int index = 0; index < monitors->length(); index++) {
     MonitorValue* mv = monitors->at(index);
-    StackValue *owner_sv = create_stack_value(mv->owner()); // it is an oop
-    result->push(new MonitorInfo(owner_sv->get_obj()(), resolve_monitor_lock(mv->basic_lock()), mv->eliminated()));
+    ScopeValue*   ov = mv->owner();
+    StackValue *owner_sv = create_stack_value(ov); // it is an oop
+    if (ov->is_object() && owner_sv->obj_is_scalar_replaced()) { // The owner object was scalar replaced
+      assert(mv->eliminated(), "monitor should be eliminated for scalar replaced object");
+      // Put klass for scalar replaced object.
+      ScopeValue* kv = ((ObjectValue *)ov)->klass();
+      assert(kv->is_constant_oop(), "klass should be oop constant for scalar replaced object");
+      KlassHandle k(((ConstantOopReadValue*)kv)->value()());
+      result->push(new MonitorInfo(k->as_klassOop(), resolve_monitor_lock(mv->basic_lock()),
+                                   mv->eliminated(), true));
+    } else {
+      result->push(new MonitorInfo(owner_sv->get_obj()(), resolve_monitor_lock(mv->basic_lock()),
+                                   mv->eliminated(), false));
+    }
   }
   return result;
 }