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 "android-base/stringprintf.h"
23
24 #include "base/dumpable.h"
25 #include "gc_root-inl.h"
26 #include "obj_ptr-inl.h"
27 #include "verify_object.h"
28
29 namespace art {
30 namespace mirror {
31 class Object;
32 } // namespace mirror
33
34 // Verifies that the indirect table lookup is valid.
35 // Returns "false" if something looks bad.
IsValidReference(IndirectRef iref,std::string * error_msg)36 inline bool IndirectReferenceTable::IsValidReference(IndirectRef iref,
37 /*out*/std::string* error_msg) const {
38 DCHECK(iref != nullptr);
39 DCHECK_EQ(GetIndirectRefKind(iref), kind_);
40 const uint32_t top_index = segment_state_.top_index;
41 uint32_t idx = ExtractIndex(iref);
42 if (UNLIKELY(idx >= top_index)) {
43 *error_msg = android::base::StringPrintf("deleted reference at index %u in a table of size %u",
44 idx,
45 top_index);
46 return false;
47 }
48 if (UNLIKELY(table_[idx].GetReference()->IsNull())) {
49 *error_msg = android::base::StringPrintf("deleted reference at index %u", idx);
50 return false;
51 }
52 uint32_t iref_serial = DecodeSerial(reinterpret_cast<uintptr_t>(iref));
53 uint32_t entry_serial = table_[idx].GetSerial();
54 if (UNLIKELY(iref_serial != entry_serial)) {
55 *error_msg = android::base::StringPrintf("stale reference with serial number %u v. current %u",
56 iref_serial,
57 entry_serial);
58 return false;
59 }
60 return true;
61 }
62
63 // Make sure that the entry at "idx" is correctly paired with "iref".
CheckEntry(const char * what,IndirectRef iref,uint32_t idx)64 inline bool IndirectReferenceTable::CheckEntry(const char* what,
65 IndirectRef iref,
66 uint32_t idx) const {
67 IndirectRef checkRef = ToIndirectRef(idx);
68 if (UNLIKELY(checkRef != iref)) {
69 std::string msg = android::base::StringPrintf(
70 "JNI ERROR (app bug): attempt to %s stale %s %p (should be %p)",
71 what,
72 GetIndirectRefKindString(kind_),
73 iref,
74 checkRef);
75 AbortIfNoCheckJNI(msg);
76 return false;
77 }
78 return true;
79 }
80
81 template<ReadBarrierOption kReadBarrierOption>
Get(IndirectRef iref)82 inline ObjPtr<mirror::Object> IndirectReferenceTable::Get(IndirectRef iref) const {
83 DCHECK_EQ(GetIndirectRefKind(iref), kind_);
84 uint32_t idx = ExtractIndex(iref);
85 DCHECK_LT(idx, segment_state_.top_index);
86 DCHECK_EQ(DecodeSerial(reinterpret_cast<uintptr_t>(iref)), table_[idx].GetSerial());
87 DCHECK(!table_[idx].GetReference()->IsNull());
88 ObjPtr<mirror::Object> obj = table_[idx].GetReference()->Read<kReadBarrierOption>();
89 VerifyObject(obj);
90 return obj;
91 }
92
Update(IndirectRef iref,ObjPtr<mirror::Object> obj)93 inline void IndirectReferenceTable::Update(IndirectRef iref, ObjPtr<mirror::Object> obj) {
94 DCHECK_EQ(GetIndirectRefKind(iref), kind_);
95 uint32_t idx = ExtractIndex(iref);
96 DCHECK_LT(idx, segment_state_.top_index);
97 DCHECK_EQ(DecodeSerial(reinterpret_cast<uintptr_t>(iref)), table_[idx].GetSerial());
98 DCHECK(!table_[idx].GetReference()->IsNull());
99 table_[idx].SetReference(obj);
100 }
101
Add(ObjPtr<mirror::Object> obj)102 inline void IrtEntry::Add(ObjPtr<mirror::Object> obj) {
103 ++serial_;
104 if (serial_ == kIRTPrevCount) {
105 serial_ = 0;
106 }
107 references_[serial_] = GcRoot<mirror::Object>(obj);
108 }
109
SetReference(ObjPtr<mirror::Object> obj)110 inline void IrtEntry::SetReference(ObjPtr<mirror::Object> obj) {
111 DCHECK_LT(serial_, kIRTPrevCount);
112 references_[serial_] = GcRoot<mirror::Object>(obj);
113 }
114
115 } // namespace art
116
117 #endif // ART_RUNTIME_INDIRECT_REFERENCE_TABLE_INL_H_
118