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
26 namespace art {
27 namespace mirror {
28 class Object;
29 } // namespace mirror
30
31 // Verifies that the indirect table lookup is valid.
32 // Returns "false" if something looks bad.
GetChecked(IndirectRef iref)33 inline 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".
CheckEntry(const char * what,IndirectRef iref,int idx)63 inline 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
75 template<ReadBarrierOption kReadBarrierOption>
Get(IndirectRef iref)76 inline 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
Update(IndirectRef iref,mirror::Object * obj)86 inline 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