C++ objArrayOop类代码示例

void ObjArrayKlass::oop_oop_iterate_elements_specialized(objArrayOop a, OopClosureType* closure) {
  T* p         = (T*)a->base();
  T* const end = p + a->length();

  for (;p < end; p++) {
    Devirtualizer<nv>::do_oop(closure, p);
  }
}

 static objArrayOop extend(objArrayOop old_pic) {
   int old_size = old_pic->length()/2;
   if (old_size >= size_of_largest_interpreterPIC) return NULL;
   objArrayOop result = allocate(old_size + 1);
   for (int index = 1; index <= old_size*2; index++) {
     result->obj_at_put(index, old_pic->obj_at(index));
   }
   return result;
 }

// this function computes the vtable size (including the size needed for miranda
// methods) and the number of miranda methods in this class
// Note on Miranda methods: Let's say there is a class C that implements
// interface I.  Let's say there is a method m in I that neither C nor any
// of its super classes implement (i.e there is no method of any access, with
// the same name and signature as m), then m is a Miranda method which is
// entered as a public abstract method in C's vtable.  From then on it should
// treated as any other public method in C for method over-ride purposes.
void klassVtable::compute_vtable_size_and_num_mirandas(int &vtable_length,
                                                       int &num_miranda_methods,
                                                       klassOop super,
                                                       objArrayOop methods,
                                                       AccessFlags class_flags,
                                                       Handle classloader,
                                                       Symbol* classname,
                                                       objArrayOop local_interfaces,
                                                       TRAPS
                                                       ) {

  No_Safepoint_Verifier nsv;

  // set up default result values
  vtable_length = 0;
  num_miranda_methods = 0;

  // start off with super's vtable length
  instanceKlass* sk = (instanceKlass*)super->klass_part();
  vtable_length = super == NULL ? 0 : sk->vtable_length();

  // go thru each method in the methods table to see if it needs a new entry
  int len = methods->length();
  for (int i = 0; i < len; i++) {
    assert(methods->obj_at(i)->is_method(), "must be a methodOop");
    methodHandle mh(THREAD, methodOop(methods->obj_at(i)));

    if (needs_new_vtable_entry(mh, super, classloader, classname, class_flags, THREAD)) {
      vtable_length += vtableEntry::size(); // we need a new entry
    }
  }

  // compute the number of mirandas methods that must be added to the end
  num_miranda_methods = get_num_mirandas(super, methods, local_interfaces);
  vtable_length += (num_miranda_methods * vtableEntry::size());

  if (Universe::is_bootstrapping() && vtable_length == 0) {
    // array classes don't have their superclass set correctly during
    // bootstrapping
    vtable_length = Universe::base_vtable_size();
  }

  if (super == NULL && !Universe::is_bootstrapping() &&
      vtable_length != Universe::base_vtable_size()) {
    // Someone is attempting to redefine java.lang.Object incorrectly.  The
    // only way this should happen is from
    // SystemDictionary::resolve_from_stream(), which will detect this later
    // and throw a security exception.  So don't assert here to let
    // the exception occur.
    vtable_length = Universe::base_vtable_size();
  }
  assert(super != NULL || vtable_length == Universe::base_vtable_size(),
         "bad vtable size for class Object");
  assert(vtable_length % vtableEntry::size() == 0, "bad vtable length");
  assert(vtable_length >= Universe::base_vtable_size(), "vtable too small");
}

void ObjArrayKlass::oop_oop_iterate_range_specialized(objArrayOop a, OopClosureType* closure, int start, int end) {
  if (Devirtualizer<nv>::do_metadata(closure)) {
    Devirtualizer<nv>::do_klass(closure, a->klass());
  }

  T* low = start == 0 ? cast_from_oop<T*>(a) : a->obj_at_addr<T>(start);
  T* high = (T*)a->base() + end;

  oop_oop_iterate_elements_specialized_bounded<nv, T>(a, closure, low, high);
}

void constantPoolCacheOopDesc::adjust_method_entries(objArrayOop old_methods,
						     objArrayOop new_methods) {
  for (int i = 0; i < old_methods->length(); i++) {
    methodOop old_method = (methodOop) old_methods->obj_at(i);
    if (! old_method->is_old_version())
      continue;
    for (int j = 0; j < length(); j++) {
      if (entry_at(j)->is_method_entry()) {
	entry_at(j)->adjust_method_entry(old_method, (methodOop) new_methods->obj_at(i));
      }
    }
  }
}

extern "C" oop* setup_deoptimization_and_return_new_sp(oop* old_sp, int* old_fp, objArrayOop frame_array, int* current_frame) {
  ResourceMark rm;

  // Save all parameters for later use (check unpack_frame_array)
  ::old_sp      = old_sp;
  ::old_fp      = old_fp;
  ::frame_array = frame_array;
  ::cur_fp      = current_frame;

  smiOop number_of_vframes = smiOop(frame_array->obj_at(StackChunkBuilder::number_of_vframes_index));
  smiOop number_of_locals  = smiOop(frame_array->obj_at(StackChunkBuilder::number_of_locals_index));

  assert(number_of_vframes->is_smi(), "must be smi");
  assert(number_of_locals->is_smi(), "must be smi");

  new_sp = old_sp - frame::interpreter_stack_size(number_of_vframes->value(),
	                                          number_of_locals->value());
  return new_sp;
}

inline void oop_pc_follow_contents_specialized(objArrayOop obj, int index, ParCompactionManager* cm) {
  const size_t len = size_t(obj->length());
  const size_t beg_index = size_t(index);
  assert(beg_index < len || len == 0, "index too large");

  const size_t stride = MIN2(len - beg_index, ObjArrayMarkingStride);
  const size_t end_index = beg_index + stride;
  T* const base = (T*)obj->base();
  T* const beg = base + beg_index;
  T* const end = base + end_index;

  // Push the non-NULL elements of the next stride on the marking stack.
  for (T* e = beg; e < end; e++) {
    cm->mark_and_push<T>(e);
  }

  if (end_index < len) {
    cm->push_objarray(obj, end_index); // Push the continuation.
  }
}

void ObjArrayKlass::oop_oop_iterate_elements_specialized_bounded(
    objArrayOop a, OopClosureType* closure, void* low, void* high) {

  T* const l = (T*)low;
  T* const h = (T*)high;

  T* p   = (T*)a->base();
  T* end = p + a->length();

  if (p < l) {
    p = l;
  }
  if (end > h) {
    end = h;
  }

  for (;p < end; ++p) {
    Devirtualizer<nv>::do_oop(closure, p);
  }
}

inline size_t G1CMTask::scan_objArray(objArrayOop obj, MemRegion mr) {
  obj->oop_iterate(_cm_oop_closure, mr);
  return mr.word_size();
}

void ObjArrayKlass::oop_oop_iterate_range_specialized(objArrayOop a, OopClosureType* closure, int start, int end) {
  T* low = start == 0 ? cast_from_oop<T*>(a) : a->obj_at_addr<T>(start);
  T* high = (T*)a->base() + end;

  oop_oop_iterate_elements_specialized_bounded<nv, T>(a, closure, low, high);
}

 static void deallocate(objArrayOop pic) {
   int entry = (pic->length()/2) - 1;
   oop first = free_list()->obj_at(entry);
   pic->obj_at_put(1, first);
   free_list()->obj_at_put(entry, pic);
 }

 static void set_first(objArrayOop pic, oop first, oop second) {
   pic->obj_at_put(1, first);
   pic->obj_at_put(2, second);
 }

 static void set_last(objArrayOop pic, oop first, oop second) {
   int size = pic->length();
   pic->obj_at_put(size--, second);
   pic->obj_at_put(size,   first);
 }

 static void set_second(objArrayOop pic, oop first, oop second) {
   pic->obj_at_put(3, first);
   pic->obj_at_put(4, second);
 }

 void flush_method_JNIid_cache() {
   for (int i = 0; i < _old_methods->length(); i++) {
     methodOop mop = (methodOop)_old_methods->obj_at(i);
     JNIid *mid = mop->jni_id();
     if (mid != NULL) {
       // don't need to call JNIid::lock() since we are at a safepoint
       mid->set_resolved_method((methodOop)NULL, (klassOop)NULL);
     }
   }
 }