Examples of com.sun.jdi.Value

com.sun.jdi.Value

The mirror for a value in the target VM. This interface is the root of a value hierarchy encompassing primitive values and object values.

Some examples of where values may be accessed:

{@link ObjectReference#getValue(com.sun.jdi.Field) ObjectReference.getValue(Field)} - value of a field
{@link StackFrame#getValue(com.sun.jdi.LocalVariable) StackFrame.getValue(LocalVariable)} - value of a variable
{@link VirtualMachine#mirrorOf(double) VirtualMachine.mirrorOf(double)} - created in the target VM by the JDI client
{@link com.sun.jdi.event.ModificationWatchpointEvent#valueToBe() ModificationWatchpointEvent.valueToBe()} - returned with an event

The following table illustrates which subinterfaces of Value are used to mirror values in the target VM --

Subinterfaces of {@link PrimitiveValue}
Kind of value	For example - expression in target	Is mirrored as an instance of	{@link Type} of value {@link #type() Value.type()}
a boolean	`true`	{@link BooleanValue}	{@link BooleanType}
a byte	`(byte)4`	{@link ByteValue}	{@link ByteType}
a char	`'a'`	{@link CharValue}	{@link CharType}
a double	`3.1415926`	{@link DoubleValue}	{@link DoubleType}
a float	`2.5f`	{@link FloatValue}	{@link FloatType}
an int	`22`	{@link IntegerValue}	{@link IntegerType}
a long	`1024L`	{@link LongValue}	{@link LongType}
a short	`(short)12`	{@link ShortValue}	{@link ShortType}
a void		{@link VoidValue}	{@link VoidType}
Subinterfaces of {@link ObjectReference}
Kind of value	For example - expression in target	Is mirrored as an instance of	{@link Type} of value {@link #type() Value.type()}
a class instance	`this`	{@link ObjectReference}	{@link ClassType}
an array	`new int[5]`	{@link ArrayReference}	{@link ArrayType}
a string	`"hello"`	{@link StringReference}	{@link ClassType}
a thread	`Thread.currentThread()`	{@link ThreadReference}	{@link ClassType}
a thread group	`Thread.currentThread() .getThreadGroup()`	{@link ThreadGroupReference}	{@link ClassType}
a `java.lang.Class` instance	`this.getClass()`	{@link ClassObjectReference}	{@link ClassType}
a class loader	`this.getClass() .getClassLoader()`	{@link ClassLoaderReference}	{@link ClassType}
Other
Kind of value	For example - expression in target	Is mirrored as	{@link Type} of value
null	`null`	`null`	n/a

@author Robert Field @author Gordon Hirsch @author James McIlree @since 1.3

  


  public static Value findValueInFrame(ThreadReference threadRef, String name,
      ObjectReference thisObj)  {
    
    Value value = null;
    try {
      SuspendThreadStack threadStack = SuspendThreadStack.getInstance();
      StackFrame stackFrame = threadRef.frame(threadStack.getCurFrame());
      
      LocalVariable localVariable;

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  }
  
  public static Value invoke(Object invoker, String methodName, List args) {
    SuspendThreadStack threadStack = SuspendThreadStack.getInstance();
    ThreadReference threadRef = threadStack.getCurThreadRef();
    Value value = null;
    Method matchedMethod = null;
    List<Method> methods = null;
    ClassType refType = null;
    ObjectReference obj  = null;
    if (invoker instanceof ClassType) {

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    }
    Iterator typeIter = argTypes.iterator();
    Iterator valIter = arguments.iterator();
    while (typeIter.hasNext()) {
      Type argType = (Type) typeIter.next();
      Value value = (Value) valIter.next();
      if (value == null) {
        if (isPrimitiveType(argType.name()))
          return false;
      }
      if (!value.type().equals(argType)) {
        if (isAssignableTo(value.type(), argType)) {
          return true;
        } else {
          return false;
        }
      }

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      }
      sb.deleteCharAt(sb.length() - 1);
      sb.append("]");
      return sb.toString();
    } else if (var instanceof ObjectReference) {
      Value strValue = invoke((ObjectReference) var, "toString",
          new ArrayList());
      return strValue.toString();
    } else if (var instanceof String) {
      return "\"" + (String)var + "\"";
      
    } else {
      return var.toString();

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    for (Expression exp :exps) {
      count ++;
      sb.append(padStr(maxLen,exp.getOriExp())).append(":");
      try {
        Value value = getJdiValue(exp);
        sb.append(getPrettyPrintStr(value)).append("\n");
      } catch (ExpressionEvalException e) {
        sb.append("exception in calc the value");
      }
    }

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        LocalVariable var = (LocalVariable) method.variables().get( 0 );//frame


        ClassType frameType = (ClassType) var.type();


        StackFrame frame = getUnderlyingStackFrame();
        Value value = frame.getValue( var );
        //getThread().getTopStackFrame().get


        //IValue value = jdivar.getValue();
        ObjectReferenceImpl o = (ObjectReferenceImpl) value;


        //if ( value instanceof JDINullValue ) {
        // return null;
        // }


        //ObjectReference o = (ObjectReference) ((JDIObjectValue) value).getUnderlyingObject();
        if ( o == null ) {
            return null;
        }


        Field field = frameType.fieldByName( methodName );
        Value val = o.getValue( field );
        return val;
    }

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      }
    }
    
    void classJarsDebug(ReferenceType rt, ThreadReference thr, ClassLoaderReference clr, String classLoaderClassName, String iHashCode) {
      try {
      Value vURLs = null;
      String pathFound = null;
      if(classloadersWithNoGetURLsMethod.contains(classLoaderClassName)) { return; }
      try {
        vURLs = simpleInvokeVMMethod(thr, clr, "getURLs");
      }

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      StringReference vToString = (StringReference) simpleInvokeVMMethod(thr, clr, "toString");
      String clrToString = vToString.value();
      
      classLoaderNames.put(iHashCode, clrToString);
      
      Value vParent = simpleInvokeVMMethod(thr, clr, "getParent");
      ObjectReference oParent = (ObjectReference) vParent;
      
      if(oParent!=null) {
        StringReference vParentToString = (StringReference) simpleInvokeVMMethod(thr, oParent, "toString");
        String parentToString = vParentToString.value();

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  void exceptionEventDebug(ExceptionEvent exc) {
    try {
      ReferenceType rt = exc.exception().referenceType();
      Field field = rt.fieldByName("detailMessage");
      //detailMessage
      Value v = exc.exception().getValue(field);
      if(exc.catchLocation()!=null) {
        logException.debug("CaughtEx: [" + exc.location() + " | catchLoc: " + exc.catchLocation() + "] "+exc.exception().referenceType().name()+": "+v.toString());
      }
      else {
        logException.debug("UncaughtEx: [" + exc.location() + "] "+exc.exception().referenceType().name()+": "+v.toString());
      }
    }
    catch(RuntimeException e) {
      log.warn("ExceptionEvent: runtime-exception: "+e);
    }

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        LocalVariable var = (LocalVariable) method.variables().get( 0 );//frame


        ClassType frameType = (ClassType) var.type();


        StackFrame frame = getUnderlyingStackFrame();
        Value value = frame.getValue( var );
        //getThread().getTopStackFrame().get


        //IValue value = jdivar.getValue();
        ObjectReferenceImpl o = (ObjectReferenceImpl) value;


        //if ( value instanceof JDINullValue ) {
        // return null;
        // }


        //ObjectReference o = (ObjectReference) ((JDIObjectValue) value).getUnderlyingObject();
        if ( o == null ) {
            return null;
        }


        Field field = frameType.fieldByName( methodName );
        Value val = o.getValue( field );
        return val;
    }

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Related Classes of com.sun.jdi.Value

com.google.code.vimsztool.debug.eval.ExpEval

com.google.code.vimsztool.debug.ExpressionEval

org.drools.eclipse.debug.core.MVELStackFrame

org.eclipse.jdi.internal.ClassTypeImpl

org.eclipse.jdi.internal.StackFrameImpl

org.eclipse.jdi.internal.ValueImpl

org.eclipse.jdt.internal.debug.core.model.JDIArrayValue

org.eclipse.jdt.internal.debug.core.model.JDIClassType

org.eclipse.jdt.internal.debug.core.model.JDIDebugTarget

org.eclipse.jdt.internal.debug.core.model.JDIModificationVariable

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{@link ObjectReference#getValue(com.sun.jdi.Field) ObjectReference.getValue(Field)}	- value of a field
{@link StackFrame#getValue(com.sun.jdi.LocalVariable) StackFrame.getValue(LocalVariable)}	- value of a variable
{@link VirtualMachine#mirrorOf(double) VirtualMachine.mirrorOf(double)}	- created in the target VM by the JDI client
{@link com.sun.jdi.event.ModificationWatchpointEvent#valueToBe() ModificationWatchpointEvent.valueToBe()}	- returned with an event