C++ GenCollectedHeap::generation_iterate方法代码示例

void GenMarkSweep::mark_sweep_phase3() {
  GenCollectedHeap* gch = GenCollectedHeap::heap();

  // Adjust the pointers to reflect the new locations
  GCTraceTime(Info, gc, phases) tm("Phase 3: Adjust pointers", gc_timer());

  // Need new claim bits for the pointer adjustment tracing.
  ClassLoaderDataGraph::clear_claimed_marks();

  // Because the closure below is created statically, we cannot
  // use OopsInGenClosure constructor which takes a generation,
  // as the Universe has not been created when the static constructors
  // are run.
  adjust_pointer_closure.set_orig_generation(gch->old_gen());

  {
    StrongRootsScope srs(1);

    gch->gen_process_roots(&srs,
                           GenCollectedHeap::OldGen,
                           false, // Younger gens are not roots.
                           GenCollectedHeap::SO_AllCodeCache,
                           GenCollectedHeap::StrongAndWeakRoots,
                           &adjust_pointer_closure,
                           &adjust_pointer_closure,
                           &adjust_cld_closure);
  }

  gch->gen_process_weak_roots(&adjust_pointer_closure);

  adjust_marks();
  GenAdjustPointersClosure blk;
  gch->generation_iterate(&blk, true);
}

void GenMarkSweep::mark_sweep_phase3(int level) {
  GenCollectedHeap* gch = GenCollectedHeap::heap();

  // Adjust the pointers to reflect the new locations
  GCTraceTime tm("phase 3", PrintGC && Verbose, true, _gc_timer, _gc_tracer->gc_id());
  trace("3");

  // Need new claim bits for the pointer adjustment tracing.
  ClassLoaderDataGraph::clear_claimed_marks();

  // Because the closure below is created statically, we cannot
  // use OopsInGenClosure constructor which takes a generation,
  // as the Universe has not been created when the static constructors
  // are run.
  adjust_pointer_closure.set_orig_generation(gch->get_gen(level));

  gch->gen_process_roots(level,
                         false, // Younger gens are not roots.
                         true,  // activate StrongRootsScope
                         SharedHeap::SO_AllCodeCache,
                         GenCollectedHeap::StrongAndWeakRoots,
                         &adjust_pointer_closure,
                         &adjust_pointer_closure,
                         &adjust_cld_closure);

  gch->gen_process_weak_roots(&adjust_pointer_closure);

  adjust_marks();
  GenAdjustPointersClosure blk;
  gch->generation_iterate(&blk, true);
}

void GenMarkSweep::mark_sweep_phase4() {
  // All pointers are now adjusted, move objects accordingly

  // It is imperative that we traverse perm_gen first in phase4. All
  // classes must be allocated earlier than their instances, and traversing
  // perm_gen first makes sure that all Klass*s have moved to their new
  // location before any instance does a dispatch through it's klass!

  // The ValidateMarkSweep live oops tracking expects us to traverse spaces
  // in the same order in phase2, phase3 and phase4. We don't quite do that
  // here (perm_gen first rather than last), so we tell the validate code
  // to use a higher index (saved from phase2) when verifying perm_gen.
  GenCollectedHeap* gch = GenCollectedHeap::heap();

  GCTraceTime(Info, gc, phases) tm("Phase 4: Move objects", _gc_timer);

  GenCompactClosure blk;
  gch->generation_iterate(&blk, true);
}