!7

// finds references to defunct class loaders

lib 1400084 // patched heap analyzer

import org.gridkit.jvmtool.heapdump.*;
import org.netbeans.lib.profiler.heap.*;
import java.lang.reflect.Field;

static Heap heap;

sbool fake = false;

p {
  consoleIcon(#1101624);
  centerHigherConsole();
  tt();
  
  if (isAbsolutePath(first(args)))
    setUserHome(first(args));

  File f = stefansOS_heapDumpFile();
  print("Loading heap dump (" + toM(fileSize(f)) + " M)...");
  heap = HeapFactory.createHeap(f);
  print("Got heap.");
  L<JavaClass> classes = heap.getAllClasses();
  print("Got " + n2(classes, "class", "classes"));
  //pnl(sortedIC(mapMethod(classes, 'getName)));
  
  L<JavaClass> classLoaderClasses = filter(classes, func(JavaClass c) -> bool { startsWithOneOf(c.getName(), "main$JavaXClassLoader", "x30$JavaXClassLoader") });
  print("Got " + n2(classLoaderClasses, "class loader class", "class loader classes"));
  L<Instance> classLoaders = concatLists(mapMethod('getInstances, classLoaderClasses));
  print("Got " + n2(classLoaders, "class loader"));
  
  L<Instance> defunctClassLoaders = filter(classLoaders, func(Instance cl) { isTrue(cl.getValueOfField('retired)) });
  print("Got " + n2(defunctClassLoaders, "defunct class loader"));
  
  print();
  if (empty(defunctClassLoaders)) {
    if (fake) {
      defunctClassLoaders = classLoaders;
      print("FAKING IT");
    } else {
      print("No memory leaks.");
      ret;
    }
  }
  
  print("Calculating GC roots...");
  
  for (Instance cl : defunctClassLoaders) {
    Instance progIDInstance = (Instance) cl.getValueOfField('progID);
    S moduleID = HeapWalker.stringValue(progIDInstance);
    print("Checking module ID: " + snippetWithTitle_cached(moduleID));
    print("\nPath to GC root:");
    printLinesWithGrowingIndent(map(func(Pair<Instance, S> p) -> S {
      joinNempties(" in ", p.b, heapWalker_className(p.a))
    }, heapWalker_pathToGCRootWithFieldNames(cl)));
    print();
    //Instance i = cl.getNearestGCRootPointer();
    //print("i => " + i);
  }
}

Began life as a copy of #1016517