/**
* NOTE: this returns objects of type JavaThread, CompilerThread, JvmtiAgentThread, and
* ServiceThread. The latter four are subclasses of the former. Most operations (fetching the top
* frame, etc.) are only allowed to be performed on a "pure" JavaThread. For this reason, {@link
* sun.jvm.hotspot.runtime.JavaThread#isJavaThread} has been changed from the definition in the VM
* (which returns true for all of these thread types) to return true for JavaThreads and false for
* the three subclasses. FIXME: should reconsider the inheritance hierarchy; see {@link
* sun.jvm.hotspot.runtime.JavaThread#isJavaThread}.
*/
public JavaThread first() {
Address threadAddr = threadListField.getValue();
if (threadAddr == null) {
return null;
}
return createJavaThreadWrapper(threadAddr);
}
public ThreadProxy getThreadProxy(Address addr) {
// Addr is the address of the JavaThread.
// Fetch the OSThread (for now and for simplicity, not making a
// separate "OSThread" class in this package)
Address osThreadAddr = osThreadField.getValue(addr);
// Get the address of the _thread_id from the OSThread
Address threadIdAddr = osThreadAddr.addOffsetTo(osThreadThreadIDField.getOffset());
JVMDebugger debugger = VM.getVM().getDebugger();
return debugger.getThreadForIdentifierAddress(threadIdAddr);
}
public JNIHandleBlock next() {
Address handleAddr = nextField.getValue(addr);
if (handleAddr == null) {
return null;
}
/* the next handle block is valid only if the current block is full */
if (top() < blockSizeInOops) {
return null;
}
return new JNIHandleBlock(handleAddr);
}
public String getDescription() {
return CStringUtilities.getString(descriptionField.getValue(addr));
}
public Address getLastJavaFP(Address addr) {
return lastJavaFPField.getValue(
addr.addOffsetTo(sun.jvm.hotspot.runtime.JavaThread.getAnchorField().getOffset()));
}
// get associated compiled native method, if available, else return null.
public NMethod getNativeMethod() {
Address addr = code.getValue(getHandle());
return (NMethod) VMObjectFactory.newObject(NMethod.class, addr);
}