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. 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". 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> 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 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
