indirect_reference_table-inl.h revision 3d21bdf8894e780d349c481e5c9e29fe1556051c 
1/*
2 * Copyright (C) 2014 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#ifndef ART_RUNTIME_INDIRECT_REFERENCE_TABLE_INL_H_
18#define ART_RUNTIME_INDIRECT_REFERENCE_TABLE_INL_H_
19
20#include "indirect_reference_table.h"
21
22#include "gc_root-inl.h"
23#include "runtime-inl.h"
24#include "verify_object-inl.h"
25
26namespace art {
27namespace mirror {
28class Object;
29}  // namespace mirror
30
31// Verifies that the indirect table lookup is valid.
32// Returns "false" if something looks bad.
33inline bool IndirectReferenceTable::GetChecked(IndirectRef iref) const {
34  if (UNLIKELY(iref == nullptr)) {
35    LOG(WARNING) << "Attempt to look up nullptr " << kind_;
36    return false;
37  }
38  if (UNLIKELY(GetIndirectRefKind(iref) == kHandleScopeOrInvalid)) {
39    LOG(ERROR) << "JNI ERROR (app bug): invalid " << kind_ << " " << iref;
40    AbortIfNoCheckJNI();
41    return false;
42  }
43  const int topIndex = segment_state_.parts.topIndex;
44  int idx = ExtractIndex(iref);
45  if (UNLIKELY(idx >= topIndex)) {
46    LOG(ERROR) << "JNI ERROR (app bug): accessed stale " << kind_ << " "
47               << iref << " (index " << idx << " in a table of size " << topIndex << ")";
48    AbortIfNoCheckJNI();
49    return false;
50  }
51  if (UNLIKELY(table_[idx].GetReference()->IsNull())) {
52    LOG(ERROR) << "JNI ERROR (app bug): accessed deleted " << kind_ << " " << iref;
53    AbortIfNoCheckJNI();
54    return false;
55  }
56  if (UNLIKELY(!CheckEntry("use", iref, idx))) {
57    return false;
58  }
59  return true;
60}
61
62// Make sure that the entry at "idx" is correctly paired with "iref".
63inline bool IndirectReferenceTable::CheckEntry(const char* what, IndirectRef iref, int idx) const {
64  IndirectRef checkRef = ToIndirectRef(idx);
65  if (UNLIKELY(checkRef != iref)) {
66    LOG(ERROR) << "JNI ERROR (app bug): attempt to " << what
67               << " stale " << kind_ << " " << iref
68               << " (should be " << checkRef << ")";
69    AbortIfNoCheckJNI();
70    return false;
71  }
72  return true;
73}
74
75template<ReadBarrierOption kReadBarrierOption>
76inline mirror::Object* IndirectReferenceTable::Get(IndirectRef iref) const {
77  if (!GetChecked(iref)) {
78    return nullptr;
79  }
80  uint32_t idx = ExtractIndex(iref);
81  mirror::Object* obj = table_[idx].GetReference()->Read<kReadBarrierOption>();
82  VerifyObject(obj);
83  return obj;
84}
85
86inline void IndirectReferenceTable::Update(IndirectRef iref, mirror::Object* obj) {
87  if (!GetChecked(iref)) {
88    LOG(WARNING) << "IndirectReferenceTable Update failed to find reference " << iref;
89    return;
90  }
91  uint32_t idx = ExtractIndex(iref);
92  table_[idx].SetReference(obj);
93}
94
95}  // namespace art
96
97#endif  // ART_RUNTIME_INDIRECT_REFERENCE_TABLE_INL_H_
98