91 lines
3.0 KiB
C++
91 lines
3.0 KiB
C++
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_RUNTIME_INDIRECT_REFERENCE_TABLE_INL_H_
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#define ART_RUNTIME_INDIRECT_REFERENCE_TABLE_INL_H_
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#include "indirect_reference_table.h"
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#include "verify_object-inl.h"
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namespace art {
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namespace mirror {
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class Object;
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} // namespace mirror
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// Verifies that the indirect table lookup is valid.
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// Returns "false" if something looks bad.
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inline bool IndirectReferenceTable::GetChecked(IndirectRef iref) const {
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if (UNLIKELY(iref == nullptr)) {
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LOG(WARNING) << "Attempt to look up NULL " << kind_;
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return false;
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}
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if (UNLIKELY(GetIndirectRefKind(iref) == kHandleScopeOrInvalid)) {
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LOG(ERROR) << "JNI ERROR (app bug): invalid " << kind_ << " " << iref;
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AbortIfNoCheckJNI();
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return false;
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}
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const int topIndex = segment_state_.parts.topIndex;
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int idx = ExtractIndex(iref);
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if (UNLIKELY(idx >= topIndex)) {
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LOG(ERROR) << "JNI ERROR (app bug): accessed stale " << kind_ << " "
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<< iref << " (index " << idx << " in a table of size " << topIndex << ")";
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AbortIfNoCheckJNI();
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return false;
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}
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if (UNLIKELY(table_[idx].GetReference()->IsNull())) {
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LOG(ERROR) << "JNI ERROR (app bug): accessed deleted " << kind_ << " " << iref;
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AbortIfNoCheckJNI();
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return false;
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}
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if (UNLIKELY(!CheckEntry("use", iref, idx))) {
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return false;
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}
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return true;
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}
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// Make sure that the entry at "idx" is correctly paired with "iref".
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inline bool IndirectReferenceTable::CheckEntry(const char* what, IndirectRef iref, int idx) const {
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IndirectRef checkRef = ToIndirectRef(idx);
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if (UNLIKELY(checkRef != iref)) {
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LOG(ERROR) << "JNI ERROR (app bug): attempt to " << what
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<< " stale " << kind_ << " " << iref
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<< " (should be " << checkRef << ")";
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AbortIfNoCheckJNI();
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return false;
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}
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return true;
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}
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template<ReadBarrierOption kReadBarrierOption>
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inline mirror::Object* IndirectReferenceTable::Get(IndirectRef iref) const {
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if (!GetChecked(iref)) {
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return kInvalidIndirectRefObject;
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}
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uint32_t idx = ExtractIndex(iref);
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mirror::Object* obj = table_[idx].GetReference()->Read<kWithoutReadBarrier>();
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if (LIKELY(obj != kClearedJniWeakGlobal)) {
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// The read barrier or VerifyObject won't handle kClearedJniWeakGlobal.
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obj = table_[idx].GetReference()->Read();
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VerifyObject(obj);
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}
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return obj;
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}
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} // namespace art
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#endif // ART_RUNTIME_INDIRECT_REFERENCE_TABLE_INL_H_
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