Implementation of Registers view.

debug/org.eclipse.cdt.debug.core/src/org/eclipse/cdt/debug/internal/core/model/CDebugTarget.java

@@ -1647,4 +1647,13 @@ public class CDebugTarget extends CDebugElement
 			((CRegisterGroup)it.next()).dispose();
 		}
 	}
+	
+	protected void preserveRegisters()
+	{
+		Iterator it = fRegisterGroups.iterator();
+		while( it.hasNext() )
+		{
+			((CRegisterGroup)it.next()).preserve();
+		}
+	}
 }

debug/org.eclipse.cdt.debug.core/src/org/eclipse/cdt/debug/internal/core/model/CRegisterGroup.java

@@ -10,6 +10,7 @@ import java.util.Arrays;
 import java.util.Iterator;
 import java.util.List;
 
+import org.eclipse.cdt.debug.core.CDebugCorePlugin;
 import org.eclipse.cdt.debug.core.cdi.CDIException;
 import org.eclipse.cdt.debug.core.cdi.ICDIRegisterObject;
 import org.eclipse.cdt.debug.core.cdi.model.ICDIRegister;
@@ -69,7 +70,7 @@ public class CRegisterGroup extends CDebugElement implements IRegisterGroup
 	 */
 	public boolean hasRegisters() throws DebugException
 	{
-		return getRegisters0().size() > 0;
+		return fRegisterObjects.length > 0;
 	}
 
 	private List getRegisters0() throws DebugException
@@ -149,4 +150,22 @@ public class CRegisterGroup extends CDebugElement implements IRegisterGroup
 			index++;
 		}
 	}
+	
+	protected void preserve()
+	{
+		if ( fRegisters == null )
+			return;
+		try
+		{
+			Iterator it = fRegisters.iterator();
+			while( it.hasNext() )
+			{
+				((CVariable)it.next()).setChanged( false );
+			}
+		}
+		catch( DebugException e )
+		{
+			CDebugCorePlugin.log( e );
+		}
+	}
 }

debug/org.eclipse.cdt.debug.core/src/org/eclipse/cdt/debug/internal/core/model/CStackFrame.java

@@ -682,7 +682,13 @@ public class CStackFrame extends CDebugElement
 		return (IVariable[])list.toArray( new IVariable[list.size()] );
 	}
 	
-	protected synchronized void preserveVariables()
+	protected synchronized void preserve()
+	{
+		preserveVariables();
+		preserveRegisters();
+	}
+
+	private void preserveVariables()
 	{
 		if ( fVariables == null )
 			return;
@@ -700,6 +706,11 @@ public class CStackFrame extends CDebugElement
 		}
 	}
 	
+	private void preserveRegisters()
+	{
+		((CDebugTarget)getDebugTarget()).preserveRegisters();
+	}
+	
 	// temporary solution
 	protected ICDIVariable findVariable( List list, ICDIVariable var )
 	{

debug/org.eclipse.cdt.debug.core/src/org/eclipse/cdt/debug/internal/core/model/CThread.java

@@ -657,7 +657,7 @@ public class CThread extends CDebugElement
 		Iterator it = fStackFrames.iterator();
 		while( it.hasNext() )
 		{
-			((CStackFrame)it.next()).preserveVariables();
+			((CStackFrame)it.next()).preserve();
 		}
 		setRefreshChildren( true );
 	}

debug/org.eclipse.cdt.debug.ui/src/org/eclipse/cdt/debug/internal/ui/views/registers/RegistersView.java

@@ -227,6 +227,13 @@ public class RegistersView extends AbstractDebugEventHandlerView
 			return;
 		}
 
+		if ( current != null && frame != null && 
+			 current instanceof IStackFrame && 
+			 ((IStackFrame)current).getDebugTarget().equals( frame.getDebugTarget() ) )
+		{
+			return;
+		}
+
 		showViewer();
 		getViewer().setInput( frame );
 	}