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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_RUNTIME_INDIRECT_REFERENCE_TABLE_INL_H_
#define ART_RUNTIME_INDIRECT_REFERENCE_TABLE_INL_H_
#include "indirect_reference_table.h"
#include "verify_object-inl.h"
namespace art {
namespace mirror {
class Object;
} // namespace mirror
// Verifies that the indirect table lookup is valid.
// Returns "false" if something looks bad.
inline bool IndirectReferenceTable::GetChecked(IndirectRef iref) const {
if (UNLIKELY(iref == nullptr)) {
LOG(WARNING) << "Attempt to look up NULL " << kind_;
return false;
}
if (UNLIKELY(GetIndirectRefKind(iref) == kSirtOrInvalid)) {
LOG(ERROR) << "JNI ERROR (app bug): invalid " << kind_ << " " << iref;
AbortIfNoCheckJNI();
return false;
}
const int topIndex = segment_state_.parts.topIndex;
int idx = ExtractIndex(iref);
if (UNLIKELY(idx >= topIndex)) {
LOG(ERROR) << "JNI ERROR (app bug): accessed stale " << kind_ << " "
<< iref << " (index " << idx << " in a table of size " << topIndex << ")";
AbortIfNoCheckJNI();
return false;
}
if (UNLIKELY(table_[idx] == nullptr)) {
LOG(ERROR) << "JNI ERROR (app bug): accessed deleted " << kind_ << " " << iref;
AbortIfNoCheckJNI();
return false;
}
if (UNLIKELY(!CheckEntry("use", iref, idx))) {
return false;
}
return true;
}
// Make sure that the entry at "idx" is correctly paired with "iref".
inline bool IndirectReferenceTable::CheckEntry(const char* what, IndirectRef iref, int idx) const {
const mirror::Object* obj = table_[idx];
IndirectRef checkRef = ToIndirectRef(obj, idx);
if (UNLIKELY(checkRef != iref)) {
LOG(ERROR) << "JNI ERROR (app bug): attempt to " << what
<< " stale " << kind_ << " " << iref
<< " (should be " << checkRef << ")";
AbortIfNoCheckJNI();
return false;
}
return true;
}
inline mirror::Object* IndirectReferenceTable::Get(IndirectRef iref) const {
if (!GetChecked(iref)) {
return kInvalidIndirectRefObject;
}
mirror::Object* obj = table_[ExtractIndex(iref)];
if (LIKELY(obj != kClearedJniWeakGlobal)) {
VerifyObject(obj);
}
return obj;
}
} // namespace art
#endif // ART_RUNTIME_INDIRECT_REFERENCE_TABLE_INL_H_
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