FunctionPlotter.java

static ByteBuffer plotAsSVGInNewIsolate(String function, double xmin, double xmax) {
    /* Create a new isolate for the function evaluation and rendering. */
    IsolateThread renderingContext = Isolates.createIsolate(CreateIsolateParameters.getDefault());
    IsolateThread nettyContext = CurrentIsolate.getCurrentThread();
    /* Copy the function String from the Netty isolate into the rendering isolate. */
    ObjectHandle functionHandle = copyString(renderingContext, function);
    
    /* Render the function. This call performs the transition from the Netty isolate to the rendering isolate, triggered by the annotations of plotAsSVG. */
    ObjectHandle resultHandle = plotAsSVG(renderingContext, nettyContext, functionHandle, xmin, xmax);
    /* Resolve and delete the resultHandle, now that execution is back in the Netty isolate. */
    ByteBuffer result = ObjectHandles.getGlobal().get(resultHandle);
    ObjectHandles.getGlobal().destroy(resultHandle);
    /* Tear down the isolate, freeing all the temporary objects. */
    Isolates.tearDownIsolate(renderingContext);
    return result;
}

@CEntryPoint
private static ObjectHandle plotAsSVG(@CEntryPoint.IsolateThreadContext IsolateThread renderingContext, IsolateThread nettyContext, ObjectHandle functionHandle, double xmin, double xmax) {
    /* Resolve and delete the functionHandle, now that execution is in the rendering isolate. */
    String function = ObjectHandles.getGlobal().get(functionHandle);
    ObjectHandles.getGlobal().destroy(functionHandle);
    ...
}