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 "verify_object-inl.h"
23
24namespace art {
25namespace mirror {
26class Object;
27}  // namespace mirror
28
29// Verifies that the indirect table lookup is valid.
30// Returns "false" if something looks bad.
31inline bool IndirectReferenceTable::GetChecked(IndirectRef iref) const {
32  if (UNLIKELY(iref == nullptr)) {
33    LOG(WARNING) << "Attempt to look up NULL " << kind_;
34    return false;
35  }
36  if (UNLIKELY(GetIndirectRefKind(iref) == kHandleScopeOrInvalid)) {
37    LOG(ERROR) << "JNI ERROR (app bug): invalid " << kind_ << " " << iref;
38    AbortIfNoCheckJNI();
39    return false;
40  }
41  const int topIndex = segment_state_.parts.topIndex;
42  int idx = ExtractIndex(iref);
43  if (UNLIKELY(idx >= topIndex)) {
44    LOG(ERROR) << "JNI ERROR (app bug): accessed stale " << kind_ << " "
45               << iref << " (index " << idx << " in a table of size " << topIndex << ")";
46    AbortIfNoCheckJNI();
47    return false;
48  }
49  if (UNLIKELY(table_[idx].IsNull())) {
50    LOG(ERROR) << "JNI ERROR (app bug): accessed deleted " << kind_ << " " << iref;
51    AbortIfNoCheckJNI();
52    return false;
53  }
54  if (UNLIKELY(!CheckEntry("use", iref, idx))) {
55    return false;
56  }
57  return true;
58}
59
60// Make sure that the entry at "idx" is correctly paired with "iref".
61inline bool IndirectReferenceTable::CheckEntry(const char* what, IndirectRef iref, int idx) const {
62  IndirectRef checkRef = ToIndirectRef(idx);
63  if (UNLIKELY(checkRef != iref)) {
64    LOG(ERROR) << "JNI ERROR (app bug): attempt to " << what
65               << " stale " << kind_ << " " << iref
66               << " (should be " << checkRef << ")";
67    AbortIfNoCheckJNI();
68    return false;
69  }
70  return true;
71}
72
73template<ReadBarrierOption kReadBarrierOption>
74inline mirror::Object* IndirectReferenceTable::Get(IndirectRef iref) const {
75  if (!GetChecked(iref)) {
76    return kInvalidIndirectRefObject;
77  }
78  uint32_t idx = ExtractIndex(iref);
79  mirror::Object* obj = table_[idx].Read<kWithoutReadBarrier>();
80  if (LIKELY(obj != kClearedJniWeakGlobal)) {
81    // The read barrier or VerifyObject won't handle kClearedJniWeakGlobal.
82    obj = table_[idx].Read();
83    VerifyObject(obj);
84  }
85  return obj;
86}
87
88}  // namespace art
89
90#endif  // ART_RUNTIME_INDIRECT_REFERENCE_TABLE_INL_H_
91