// we set an observer to detect VirtualMachineImpl.dispose call
// and on dispose we add corresponding VirtualMachineImpl.class to
// free VirtualMachimeImpl Class list.
protected static void setVMDisposeObserver(final Object vm) {
try {
Method setDisposeObserverMethod =
vm.getClass()
.getDeclaredMethod("setDisposeObserver", new Class[] {java.util.Observer.class});
setDisposeObserverMethod.setAccessible(true);
setDisposeObserverMethod.invoke(
vm,
new Object[] {
new Observer() {
public void update(Observable o, Object data) {
if (DEBUG) {
System.out.println("got VM.dispose notification");
}
addFreeVMImplClass(vm.getClass());
}
}
});
} catch (Exception exp) {
if (DEBUG) {
System.out.println("setVMDisposeObserver() got an exception:");
exp.printStackTrace();
}
}
}
public VirtualMachine attach(Map arguments)
throws IOException, IllegalConnectorArgumentsException {
int pid = 0;
try {
pid = Integer.parseInt(argument(ARG_PID, arguments).value());
} catch (NumberFormatException nfe) {
throw (IllegalConnectorArgumentsException)
new IllegalConnectorArgumentsException(nfe.getMessage(), ARG_PID).initCause(nfe);
}
checkProcessAttach(pid);
VirtualMachine myVM = null;
try {
try {
Class vmImplClass = loadVirtualMachineImplClass();
myVM = createVirtualMachine(vmImplClass, pid);
} catch (InvocationTargetException ite) {
Class vmImplClass = handleVMVersionMismatch(ite);
if (vmImplClass != null) {
return createVirtualMachine(vmImplClass, pid);
} else {
throw ite;
}
}
} catch (Exception ee) {
if (DEBUG) {
System.out.println("VirtualMachineImpl() got an exception:");
ee.printStackTrace();
System.out.println("pid = " + pid);
}
throw (IOException) new IOException().initCause(ee);
}
setVMDisposeObserver(myVM);
return myVM;
}
/**
* If the causal chain has a sun.jvm.hotspot.runtime.VMVersionMismatchException, attempt to load
* VirtualMachineImpl class for target VM version.
*/
protected static Class handleVMVersionMismatch(InvocationTargetException ite) {
Throwable cause = ite.getCause();
if (DEBUG) {
System.out.println("checking for version mismatch...");
}
while (cause != null) {
try {
if (isVMVersionMismatch(cause)) {
if (DEBUG) {
System.out.println("Triggering cross VM version support...");
}
return loadVirtualMachineImplClass(getVMVersion(cause));
}
} catch (Exception exp) {
if (DEBUG) {
System.out.println("failed to load VirtualMachineImpl class");
exp.printStackTrace();
}
return null;
}
cause = cause.getCause();
}
return null;
}
/**
* Move through a list of stack frames, searching for references to code found in the current
* sketch. Return with a RunnerException that contains the location of the error, or if nothing is
* found, just return with a RunnerException that wraps the error message itself.
*/
protected SketchException findException(
String message, ObjectReference or, ThreadReference thread) {
try {
// use to dump the stack for debugging
// for (StackFrame frame : thread.frames()) {
// System.out.println("frame: " + frame);
// }
List<StackFrame> frames = thread.frames();
for (StackFrame frame : frames) {
try {
Location location = frame.location();
String filename = null;
filename = location.sourceName();
int lineNumber = location.lineNumber() - 1;
SketchException rex = build.placeException(message, filename, lineNumber);
if (rex != null) {
return rex;
}
} catch (AbsentInformationException e) {
// Any of the thread.blah() methods can throw an AbsentInformationEx
// if that bit of data is missing. If so, just write out the error
// message to the console.
// e.printStackTrace(); // not useful
exception = new SketchException(message);
exception.hideStackTrace();
listener.statusError(exception);
}
}
} catch (IncompatibleThreadStateException e) {
// This shouldn't happen, but if it does, print the exception in case
// it's something that needs to be debugged separately.
e.printStackTrace();
}
// before giving up, try to extract from the throwable object itself
// since sometimes exceptions are re-thrown from a different context
try {
// assume object reference is Throwable, get stack trace
Method method =
((ClassType) or.referenceType())
.concreteMethodByName("getStackTrace", "()[Ljava/lang/StackTraceElement;");
ArrayReference result =
(ArrayReference)
or.invokeMethod(
thread, method, new ArrayList<Value>(), ObjectReference.INVOKE_SINGLE_THREADED);
// iterate through stack frames and pull filename and line number for each
for (Value val : result.getValues()) {
ObjectReference ref = (ObjectReference) val;
method =
((ClassType) ref.referenceType())
.concreteMethodByName("getFileName", "()Ljava/lang/String;");
StringReference strref =
(StringReference)
ref.invokeMethod(
thread, method, new ArrayList<Value>(), ObjectReference.INVOKE_SINGLE_THREADED);
String filename = strref == null ? "Unknown Source" : strref.value();
method = ((ClassType) ref.referenceType()).concreteMethodByName("getLineNumber", "()I");
IntegerValue intval =
(IntegerValue)
ref.invokeMethod(
thread, method, new ArrayList<Value>(), ObjectReference.INVOKE_SINGLE_THREADED);
int lineNumber = intval.intValue() - 1;
SketchException rex = build.placeException(message, filename, lineNumber);
if (rex != null) {
return rex;
}
}
// for (Method m : ((ClassType) or.referenceType()).allMethods()) {
// System.out.println(m + " | " + m.signature() + " | " + m.genericSignature());
// }
// Implemented for 2.0b9, writes a stack trace when there's an internal error inside core.
method = ((ClassType) or.referenceType()).concreteMethodByName("printStackTrace", "()V");
// System.err.println("got method " + method);
or.invokeMethod(
thread, method, new ArrayList<Value>(), ObjectReference.INVOKE_SINGLE_THREADED);
} catch (Exception e) {
e.printStackTrace();
}
// Give up, nothing found inside the pile of stack frames
SketchException rex = new SketchException(message);
// exception is being created /here/, so stack trace is not useful
rex.hideStackTrace();
return rex;
}
