| /******************************************************************************* |
| * Copyright (c) 2000, 2003 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jdi.internal; |
| |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.DataInputStream; |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.eclipse.jdi.internal.jdwp.JdwpCommandPacket; |
| import org.eclipse.jdi.internal.jdwp.JdwpFrameID; |
| import org.eclipse.jdi.internal.jdwp.JdwpID; |
| import org.eclipse.jdi.internal.jdwp.JdwpReplyPacket; |
| |
| import com.sun.jdi.AbsentInformationException; |
| import com.sun.jdi.ClassNotLoadedException; |
| import com.sun.jdi.InvalidStackFrameException; |
| import com.sun.jdi.InvalidTypeException; |
| import com.sun.jdi.LocalVariable; |
| import com.sun.jdi.Locatable; |
| import com.sun.jdi.Location; |
| import com.sun.jdi.ObjectReference; |
| import com.sun.jdi.StackFrame; |
| import com.sun.jdi.ThreadReference; |
| import com.sun.jdi.VMMismatchException; |
| import com.sun.jdi.Value; |
| |
| /** |
| * this class implements the corresponding interfaces |
| * declared by the JDI specification. See the com.sun.jdi package |
| * for more information. |
| * |
| */ |
| public class StackFrameImpl extends MirrorImpl implements StackFrame, Locatable { |
| /** FrameID that corresponds to this reference. */ |
| private JdwpFrameID fFrameID; |
| /** Thread under which this frame's method is running. */ |
| private ThreadReferenceImpl fThread; |
| /** Location of the current instruction in the frame. */ |
| private LocationImpl fLocation; |
| |
| /** |
| * Creates new StackFrameImpl. |
| */ |
| public StackFrameImpl(VirtualMachineImpl vmImpl, JdwpFrameID ID, ThreadReferenceImpl thread, LocationImpl location) { |
| super("StackFrame", vmImpl); //$NON-NLS-1$ |
| fFrameID = ID; |
| fThread = thread; |
| fLocation = location; |
| } |
| |
| /** |
| * @return Returns the Value of a LocalVariable in this frame. |
| */ |
| public Value getValue(LocalVariable variable) throws IllegalArgumentException, InvalidStackFrameException, VMMismatchException { |
| ArrayList list = new ArrayList(1); |
| list.add(variable); |
| return (ValueImpl)getValues(list).get(variable); |
| } |
| |
| /** |
| * @return Returns the values of multiple local variables in this frame. |
| */ |
| public Map getValues(List variables) throws IllegalArgumentException, InvalidStackFrameException, VMMismatchException { |
| // Note that this information should not be cached. |
| Map map = new HashMap(variables.size()); |
| // if the variable list is empty, nothing to do |
| if (variables.isEmpty()) { |
| return map; |
| } |
| /* |
| * If 'this' is requested, we have to use a special JDWP request. |
| * Therefore, we remember the positions in the list of requests for 'this'. |
| */ |
| int sizeAll = variables.size(); |
| int sizeThis = 0; |
| boolean[] isThisValue = new boolean[sizeAll]; |
| for (int i = 0; i < sizeAll; i++) { |
| LocalVariableImpl var = (LocalVariableImpl)variables.get(i); |
| isThisValue[i] = var.isThis(); |
| if (isThisValue[i]) { |
| sizeThis++; |
| } |
| } |
| int sizeNotThis = sizeAll - sizeThis; |
| |
| if (sizeThis > 0) { |
| Value thisValue = thisObject(); |
| for (int i = 0; i < sizeAll; i++) { |
| if (isThisValue[i]) { |
| map.put(variables.get(i), thisValue); |
| } |
| } |
| } |
| |
| // If only 'this' was requested, we're finished. |
| if (sizeNotThis == 0) { |
| return map; |
| } |
| |
| // Request values for local variables other than 'this'. |
| initJdwpRequest(); |
| try { |
| ByteArrayOutputStream outBytes = new ByteArrayOutputStream(); |
| DataOutputStream outData = new DataOutputStream(outBytes); |
| writeWithThread(this, outData); |
| writeInt(sizeNotThis, "size", outData); //$NON-NLS-1$ |
| for (int i = 0; i < sizeAll; i++) { |
| if (!isThisValue[i]) { |
| LocalVariableImpl var = (LocalVariableImpl)variables.get(i); |
| checkVM(var); |
| writeInt(var.slot(), "slot", outData); //$NON-NLS-1$ |
| writeByte(var.tag(), "tag", JdwpID.tagMap(), outData); //$NON-NLS-1$ |
| } |
| } |
| JdwpReplyPacket replyPacket = requestVM(JdwpCommandPacket.SF_GET_VALUES, outBytes); |
| defaultReplyErrorHandler(replyPacket.errorCode()); |
| |
| DataInputStream replyData = replyPacket.dataInStream(); |
| int nrOfElements = readInt("elements", replyData); //$NON-NLS-1$ |
| if (nrOfElements != sizeNotThis) |
| throw new InternalError(JDIMessages.getString("StackFrameImpl.Retrieved_a_different_number_of_values_from_the_VM_than_requested_1")); //$NON-NLS-1$ |
| |
| for (int i = 0, j = 0; i < sizeAll; i++) { |
| if (!isThisValue[i]) |
| map.put(variables.get(j++), ValueImpl.readWithTag(this, replyData)); |
| } |
| return map; |
| } catch (IOException e) { |
| defaultIOExceptionHandler(e); |
| return null; |
| } finally { |
| handledJdwpRequest(); |
| } |
| } |
| |
| /** |
| * @return Returns the Location of the current instruction in the frame. |
| */ |
| public Location location() { |
| return fLocation; |
| } |
| |
| /** |
| * Sets the Value of a LocalVariable in this frame. |
| */ |
| public void setValue(LocalVariable var, Value value) throws InvalidTypeException, ClassNotLoadedException { |
| // Note that this information should not be cached. |
| initJdwpRequest(); |
| try { |
| ByteArrayOutputStream outBytes = new ByteArrayOutputStream(); |
| DataOutputStream outData = new DataOutputStream(outBytes); |
| ((ThreadReferenceImpl)thread()).write(this, outData); |
| write(this, outData); |
| writeInt(1, "size", outData); // We only set one field //$NON-NLS-1$ |
| checkVM(var); |
| writeInt(((LocalVariableImpl)var).slot(), "slot", outData); //$NON-NLS-1$ |
| |
| // check the type and the vm of the value, convert the value if needed. |
| ValueImpl checkedValue= ValueImpl.checkValue(value, var.type(), virtualMachineImpl()); |
| |
| if (checkedValue != null) { |
| checkedValue.writeWithTag(this, outData); |
| } else { |
| ValueImpl.writeNullWithTag(this, outData); |
| } |
| |
| JdwpReplyPacket replyPacket = requestVM(JdwpCommandPacket.SF_SET_VALUES, outBytes); |
| switch (replyPacket.errorCode()) { |
| case JdwpReplyPacket.TYPE_MISMATCH: |
| throw new InvalidTypeException(); |
| case JdwpReplyPacket.INVALID_CLASS: |
| throw new ClassNotLoadedException(var.typeName()); |
| } |
| defaultReplyErrorHandler(replyPacket.errorCode()); |
| } catch (IOException e) { |
| defaultIOExceptionHandler(e); |
| } finally { |
| handledJdwpRequest(); |
| } |
| } |
| |
| /** |
| * @return Returns the value of 'this' for the current frame. |
| */ |
| public ObjectReference thisObject() throws InvalidStackFrameException { |
| // Note that this information should not be cached. |
| initJdwpRequest(); |
| try { |
| ByteArrayOutputStream outBytes = new ByteArrayOutputStream(); |
| DataOutputStream outData = new DataOutputStream(outBytes); |
| writeWithThread(this, outData); |
| |
| JdwpReplyPacket replyPacket = requestVM(JdwpCommandPacket.SF_THIS_OBJECT, outBytes); |
| defaultReplyErrorHandler(replyPacket.errorCode()); |
| |
| DataInputStream replyData = replyPacket.dataInStream(); |
| ObjectReference result = ObjectReferenceImpl.readObjectRefWithTag(this, replyData); |
| return result; |
| } catch (IOException e) { |
| defaultIOExceptionHandler(e); |
| return null; |
| } finally { |
| handledJdwpRequest(); |
| } |
| } |
| |
| /** |
| * @return Returns the thread under which this frame's method is running. |
| */ |
| public ThreadReference thread() { |
| return fThread; |
| } |
| |
| /** |
| * @return Returns a LocalVariable that matches the given name and is visible at the current frame location. |
| */ |
| public LocalVariable visibleVariableByName(String name) throws AbsentInformationException { |
| Iterator iter = visibleVariables().iterator(); |
| while (iter.hasNext()) { |
| LocalVariableImpl var = (LocalVariableImpl)iter.next(); |
| if (var.name().equals(name)) { |
| return var; |
| } |
| } |
| |
| return null; |
| } |
| |
| /** |
| * @return Returns the values of multiple local variables in this frame. |
| */ |
| public List visibleVariables() throws AbsentInformationException { |
| List variables= fLocation.method().variables(); |
| Iterator iter = variables.iterator(); |
| List visibleVars = new ArrayList(variables.size()); |
| while (iter.hasNext()) { |
| LocalVariableImpl var = (LocalVariableImpl)iter.next(); |
| // Only return local variables other than the this pointer. |
| if (var.isVisible(this) && !var.isThis()) { |
| visibleVars.add(var); |
| } |
| } |
| return visibleVars; |
| } |
| |
| /** |
| * @return Returns the hash code value. |
| */ |
| public int hashCode() { |
| return fThread.hashCode() + fFrameID.hashCode(); |
| } |
| |
| /** |
| * @return Returns true if two mirrors refer to the same entity in the target VM. |
| * @see java.lang.Object#equals(Object) |
| */ |
| public boolean equals(Object object) { |
| return object != null && object.getClass().equals(this.getClass()) && fThread.equals(((StackFrameImpl)object).fThread) && fFrameID.equals(((StackFrameImpl)object).fFrameID); |
| } |
| |
| /** |
| * Writes JDWP representation. |
| */ |
| public void write(MirrorImpl target, DataOutputStream out) throws IOException { |
| fFrameID.write(out); |
| if (target.fVerboseWriter != null) { |
| target.fVerboseWriter.println("stackFrame", fFrameID.value()); //$NON-NLS-1$ |
| } |
| } |
| |
| /** |
| * Writes JDWP representation. |
| */ |
| public void writeWithThread(MirrorImpl target, DataOutputStream out) throws IOException { |
| fThread.write(target, out); |
| write(target, out); |
| } |
| |
| /** |
| * @return Reads JDWP representation and returns new instance. |
| */ |
| public static StackFrameImpl readWithLocation(MirrorImpl target, ThreadReferenceImpl thread, DataInputStream in) throws IOException { |
| VirtualMachineImpl vmImpl = target.virtualMachineImpl(); |
| JdwpFrameID ID = new JdwpFrameID(vmImpl); |
| ID.read(in); |
| if (target.fVerboseWriter != null) { |
| target.fVerboseWriter.println("stackFrame", ID.value()); //$NON-NLS-1$ |
| } |
| |
| if (ID.isNull()) { |
| return null; |
| } |
| LocationImpl location = LocationImpl.read(target, in); |
| if (location == null) { |
| return null; |
| } |
| |
| return new StackFrameImpl(vmImpl, ID, thread, location); |
| } |
| } |