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
24 namespace art {
25 namespace mirror {
26 class Object;
27 } // namespace mirror
28
29 // Verifies that the indirect table lookup is valid.
30 // Returns "false" if something looks bad.
GetChecked(IndirectRef iref)31 inline 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].GetReference()->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".
CheckEntry(const char * what,IndirectRef iref,int idx)61 inline 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
73 template<ReadBarrierOption kReadBarrierOption>
Get(IndirectRef iref)74 inline 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].GetReference()->Read<kWithoutReadBarrier>();
80 if (LIKELY(obj != kClearedJniWeakGlobal)) {
81 // The read barrier or VerifyObject won't handle kClearedJniWeakGlobal.
82 obj = table_[idx].GetReference()->Read();
83 VerifyObject(obj);
84 }
85 return obj;
86 }
87
88 } // namespace art
89
90 #endif // ART_RUNTIME_INDIRECT_REFERENCE_TABLE_INL_H_
91