CachedClassLoader newLoader = getAndRetainLoader(spec, id, factoryFunction);
                byId.put(id, newLoader);

                if (cachedLoader != null) {
                    LOGGER.debug("Releasing previous classloader for {}", id);
                    cachedLoader.release(id);
                }
                return newLoader.classLoader;
            } else {

    }

    private Loader storeIfAbsent(ProtectionDomain domain, Loader newLoader) {
        Loader oldLoader = loaders.putIfAbsent(domain, newLoader);
        if (oldLoader != null) {
            // Discard the new loader, someone beat us with storing it.
            IoActions.closeQuietly(newLoader);
            return oldLoader;
        }
        return newLoader;
    }

    @Override
    public void close() {

	"testing"
)

func setUpContext(arch *sys.Arch, iself bool, ht objabi.HeadType, bm, lm string) *Link {
	ctxt := linknew(arch)
	ctxt.HeadType = ht
	er := loader.ErrorReporter{}
	ctxt.loader = loader.NewLoader(0, &er)
	ctxt.BuildMode.Set(bm)
	ctxt.LinkMode.Set(lm)
	ctxt.IsELF = iself
	ctxt.mustSetHeadType()
	ctxt.setArchSyms()
	return ctxt
}

// Make sure the addgotsym properly increases the symbols.

  }

  public void testDecoupledLoader() {
    FinalizableReferenceQueue.DecoupledLoader decoupledLoader =
        new FinalizableReferenceQueue.DecoupledLoader() {
          @Override
          URLClassLoader newLoader(URL base) {
            return new DecoupledClassLoader(new URL[] {base});
          }
        };

    Class<?> finalizerCopy = decoupledLoader.loadFinalizer();

    assertNotNull(finalizerCopy);

         * Finalizer.class -> CustomClassLoader -> CustomClassLoader.class -> This class loader
         *
         * System class loader will (and must) be the parent.
         */
        ClassLoader finalizerLoader = newLoader(getBaseUrl());
        return finalizerLoader.loadClass(FINALIZER_CLASS_NAME);
      } catch (Exception e) {
        logger.log(Level.WARNING, LOADING_ERROR, e);
        return null;
      }
    }

         * Finalizer.class -> CustomClassLoader -> CustomClassLoader.class -> This class loader
         *
         * System class loader will (and must) be the parent.
         */
        ClassLoader finalizerLoader = newLoader(getBaseUrl());
        return finalizerLoader.loadClass(FINALIZER_CLASS_NAME);
      } catch (Exception e) {
        logger.log(Level.WARNING, LOADING_ERROR, e);
        return null;
      }
    }

	idx := uint32(len(ldr.objSyms))
	st := loadState{l: ldr}
	return st.addSym(name, 0, or, idx, nonPkgDef, &goobj.Sym{})
}

func mkLoader() *Loader {
	er := ErrorReporter{}
	ldr := NewLoader(0, &er)
	er.ldr = ldr
	return ldr
}

func TestAddMaterializedSymbol(t *testing.T) {
	ldr := mkLoader()
	dummyOreader := oReader{version: -1, syms: make([]Sym, 100)}
	or := &dummyOreader

	switch *FlagStrictDups {
	case 0:
		// nothing to do
	case 1, 2:
		flags |= loader.FlagStrictDups
	default:
		log.Fatalf("invalid -strictdups flag value %d", *FlagStrictDups)
	}
	ctxt.loader = loader.NewLoader(flags, &ctxt.ErrorReporter.ErrorReporter)
	ctxt.ErrorReporter.SymName = func(s loader.Sym) string {
		return ctxt.loader.SymName(s)
	}

	// ctxt.Library grows during the loop, so not a range loop.
	i := 0

	relocs []goobj.Reloc
	data   []byte
	auxs   []goobj.Aux
}

const (
	// Loader.flags
	FlagStrictDups = 1 << iota
	FlagCheckLinkname
)

func NewLoader(flags uint32, reporter *ErrorReporter) *Loader {
	nbuiltin := goobj.NBuiltin()
	extReader := &oReader{objidx: extObj}
	ldr := &Loader{