// purely for debugging.
func gcMarkRootCheck() {
	if work.markrootNext < work.markrootJobs {
		print(work.markrootNext, " of ", work.markrootJobs, " markroot jobs done\n")
		throw("left over markroot jobs")
	}

	// Check that stacks have been scanned.
	//
	// We only check the first nStackRoots Gs that we should have scanned.
	// Since we don't care about newer Gs (see comment in

   collection roots. More specifically, any pointer must either be
   accessible through a global variable or be added as an explicit
   garbage collection root in `runtime.markroot`.

2. If the memory is reused, the heap pointers must be zero-initialized
   before they become visible as GC roots. Otherwise, the GC may
   observe stale heap pointers. See "Zero-initialization versus
   zeroing".

				reflectcall(nil, unsafe.Pointer(f.fn), frame, uint32(framesz), uint32(framesz), uint32(framesz), &regs)
				fingStatus.And(^fingRunningFinalizer)

				// Drop finalizer queue heap references
				// before hiding them from markroot.
				// This also ensures these will be
				// clear if we reuse the finalizer.
				f.fn = nil
				f.arg = nil
				f.ot = nil
				atomic.Store(&fb.cnt, i-1)
			}
			next := fb.next
			lock(&finlock)

	// close.
	//
	// Put this field here because it needs 64-bit atomic access
	// (and thus 8-byte alignment even on 32-bit architectures).
	bytesMarked uint64

	markrootNext uint32 // next markroot job
	markrootJobs uint32 // number of markroot jobs

	nproc  uint32
	tstart int64
	nwait  uint32

	// Number of roots of various root types. Set by gcMarkRootPrepare.
	//

        executedAndNotSkipped ':jar', ':unpackJar'
    }

    private def createTar(String name, Closure cl) {
        TestFile tarRoot = file("${name}.root")
        tarRoot.deleteDir()
        TestFile tar = file(name)
        tar.delete()
        tarRoot.create(cl)
        tarRoot.tarTo(tar)
    }

    private def createFilesStructureForDupeTests() {
        createDir('dir1', {

        !file('build').exists()
    }

    private def createTar(String name, Closure cl) {
        TestFile tarRoot = file("${name}.root")
        tarRoot.deleteDir()
        TestFile tar = file(name)
        tar.delete()
        tarRoot.create(cl)
        tarRoot.tarTo(tar)
    }

    private String defineUpdateTask(String archiveType) {
        return """