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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 "android-base/stringprintf.h"
#include "base/dumpable.h"
#include "gc_root-inl.h"
#include "obj_ptr-inl.h"
#include "verify_object.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::IsValidReference(IndirectRef iref,
/*out*/std::string* error_msg) const {
DCHECK(iref != nullptr);
DCHECK_EQ(GetIndirectRefKind(iref), kind_);
const uint32_t top_index = segment_state_.top_index;
uint32_t idx = ExtractIndex(iref);
if (UNLIKELY(idx >= top_index)) {
*error_msg = android::base::StringPrintf("deleted reference at index %u in a table of size %u",
idx,
top_index);
return false;
}
if (UNLIKELY(table_[idx].GetReference()->IsNull())) {
*error_msg = android::base::StringPrintf("deleted reference at index %u", idx);
return false;
}
uint32_t iref_serial = DecodeSerial(reinterpret_cast<uintptr_t>(iref));
uint32_t entry_serial = table_[idx].GetSerial();
if (UNLIKELY(iref_serial != entry_serial)) {
*error_msg = android::base::StringPrintf("stale reference with serial number %u v. current %u",
iref_serial,
entry_serial);
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,
uint32_t idx) const {
IndirectRef checkRef = ToIndirectRef(idx);
if (UNLIKELY(checkRef != iref)) {
std::string msg = android::base::StringPrintf(
"JNI ERROR (app bug): attempt to %s stale %s %p (should be %p)",
what,
GetIndirectRefKindString(kind_),
iref,
checkRef);
AbortIfNoCheckJNI(msg);
return false;
}
return true;
}
template<ReadBarrierOption kReadBarrierOption>
inline ObjPtr<mirror::Object> IndirectReferenceTable::Get(IndirectRef iref) const {
DCHECK_EQ(GetIndirectRefKind(iref), kind_);
uint32_t idx = ExtractIndex(iref);
DCHECK_LT(idx, segment_state_.top_index);
DCHECK_EQ(DecodeSerial(reinterpret_cast<uintptr_t>(iref)), table_[idx].GetSerial());
DCHECK(!table_[idx].GetReference()->IsNull());
ObjPtr<mirror::Object> obj = table_[idx].GetReference()->Read<kReadBarrierOption>();
VerifyObject(obj);
return obj;
}
inline void IndirectReferenceTable::Update(IndirectRef iref, ObjPtr<mirror::Object> obj) {
DCHECK_EQ(GetIndirectRefKind(iref), kind_);
uint32_t idx = ExtractIndex(iref);
DCHECK_LT(idx, segment_state_.top_index);
DCHECK_EQ(DecodeSerial(reinterpret_cast<uintptr_t>(iref)), table_[idx].GetSerial());
DCHECK(!table_[idx].GetReference()->IsNull());
table_[idx].SetReference(obj);
}
inline void IrtEntry::Add(ObjPtr<mirror::Object> obj) {
++serial_;
if (serial_ == kIRTPrevCount) {
serial_ = 0;
}
references_[serial_] = GcRoot<mirror::Object>(obj);
}
inline void IrtEntry::SetReference(ObjPtr<mirror::Object> obj) {
DCHECK_LT(serial_, kIRTPrevCount);
references_[serial_] = GcRoot<mirror::Object>(obj);
}
} // namespace art
#endif // ART_RUNTIME_INDIRECT_REFERENCE_TABLE_INL_H_
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