1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "jobject_comparator.h"
18
19#include "mirror/array-inl.h"
20#include "mirror/class-inl.h"
21#include "mirror/object-inl.h"
22#include "scoped_thread_state_change.h"
23
24namespace art {
25
26bool JobjectComparator::operator()(jobject jobj1, jobject jobj2) const {
27  // Ensure null references and cleared jweaks appear at the end.
28  if (jobj1 == nullptr) {
29    return true;
30  } else if (jobj2 == nullptr) {
31    return false;
32  }
33  ScopedObjectAccess soa(Thread::Current());
34  StackHandleScope<2> hs(soa.Self());
35  Handle<mirror::Object> obj1(hs.NewHandle(soa.Decode<mirror::Object*>(jobj1)));
36  Handle<mirror::Object> obj2(hs.NewHandle(soa.Decode<mirror::Object*>(jobj2)));
37  if (obj1.Get() == nullptr) {
38    return true;
39  } else if (obj2.Get() == nullptr) {
40    return false;
41  }
42  // Sort by class...
43  if (obj1->GetClass() != obj2->GetClass()) {
44    return obj1->GetClass()->IdentityHashCode() < obj2->GetClass()->IdentityHashCode();
45  }
46  // ...then by size...
47  const size_t count1 = obj1->SizeOf();
48  const size_t count2 = obj2->SizeOf();
49  if (count1 != count2) {
50    return count1 < count2;
51  }
52  // ...and finally by identity hash code.
53  return obj1->IdentityHashCode() < obj2->IdentityHashCode();
54}
55
56}  // namespace art
57