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/*
* Copyright (C) 2022 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_JNI_LOCAL_REFERENCE_TABLE_INL_H_
#define ART_RUNTIME_JNI_LOCAL_REFERENCE_TABLE_INL_H_
#include "local_reference_table.h"
#include "android-base/stringprintf.h"
#include "base/casts.h"
#include "gc_root-inl.h"
#include "obj_ptr-inl.h"
#include "mirror/object_reference.h"
#include "verify_object.h"
namespace art {
namespace jni {
inline void LrtEntry::SetReference(ObjPtr<mirror::Object> ref) {
root_ = GcRoot<mirror::Object>(
mirror::CompressedReference<mirror::Object>::FromMirrorPtr(ref.Ptr()));
DCHECK(!IsFree());
DCHECK(!IsSerialNumber());
}
inline ObjPtr<mirror::Object> LrtEntry::GetReference() {
DCHECK(!IsFree());
DCHECK(!IsSerialNumber());
DCHECK(!IsNull());
// Local references do not need read barriers. They are marked during the thread root flip.
return root_.Read<kWithoutReadBarrier>();
}
inline void LrtEntry::SetNextFree(uint32_t next_free) {
SetVRegValue(NextFreeField::Update(next_free, 1u << kFlagFree));
DCHECK(IsFree());
DCHECK(!IsSerialNumber());
}
inline void LrtEntry::SetSerialNumber(uint32_t serial_number) {
SetVRegValue(SerialNumberField::Update(serial_number, 1u << kFlagSerialNumber));
DCHECK(!IsFree());
DCHECK(IsSerialNumber());
}
inline void LrtEntry::SetVRegValue(uint32_t value) {
root_ = GcRoot<mirror::Object>(
mirror::CompressedReference<mirror::Object>::FromVRegValue(value));
}
inline uint32_t LocalReferenceTable::GetReferenceEntryIndex(IndirectRef iref) const {
DCHECK_EQ(IndirectReferenceTable::GetIndirectRefKind(iref), kLocal);
LrtEntry* entry = ToLrtEntry(iref);
if (LIKELY(small_table_ != nullptr)) {
DCHECK(tables_.empty());
if (!std::less<const LrtEntry*>()(entry, small_table_) &&
std::less<const LrtEntry*>()(entry, small_table_ + kSmallLrtEntries)) {
return dchecked_integral_cast<uint32_t>(entry - small_table_);
}
} else {
for (size_t i = 0, size = tables_.size(); i != size; ++i) {
LrtEntry* table = tables_[i];
size_t table_size = GetTableSize(i);
if (!std::less<const LrtEntry*>()(entry, table) &&
std::less<const LrtEntry*>()(entry, table + table_size)) {
return dchecked_integral_cast<size_t>(i != 0u ? table_size : 0u) +
dchecked_integral_cast<size_t>(entry - table);
}
}
}
return std::numeric_limits<uint32_t>::max();
}
inline bool LocalReferenceTable::IsValidReference(IndirectRef iref,
/*out*/std::string* error_msg) const {
uint32_t entry_index = GetReferenceEntryIndex(iref);
if (UNLIKELY(entry_index == std::numeric_limits<uint32_t>::max())) {
*error_msg = android::base::StringPrintf("reference outside the table: %p", iref);
return false;
}
if (UNLIKELY(entry_index >= segment_state_.top_index)) {
*error_msg = android::base::StringPrintf("popped reference at index %u in a table of size %u",
entry_index,
segment_state_.top_index);
return false;
}
LrtEntry* entry = ToLrtEntry(iref);
LrtEntry* serial_number_entry = GetCheckJniSerialNumberEntry(entry);
if (serial_number_entry->IsSerialNumber()) {
// This reference was created with CheckJNI enabled.
uint32_t expected_serial_number = serial_number_entry->GetSerialNumber();
uint32_t serial_number = entry - serial_number_entry;
DCHECK_LT(serial_number, kCheckJniEntriesPerReference);
if (serial_number != expected_serial_number || serial_number == 0u) {
*error_msg = android::base::StringPrintf(
"reference at index %u with bad serial number %u v. %u (valid 1 - %u)",
entry_index,
serial_number,
expected_serial_number,
dchecked_integral_cast<uint32_t>(kCheckJniEntriesPerReference - 1u));
return false;
}
}
if (UNLIKELY(entry->IsFree())) {
*error_msg = android::base::StringPrintf("deleted reference at index %u", entry_index);
return false;
}
if (UNLIKELY(entry->IsNull())) {
// This should never really happen and may indicate memory coruption.
*error_msg = android::base::StringPrintf("null reference at index %u", entry_index);
return false;
}
return true;
}
inline void LocalReferenceTable::DCheckValidReference(IndirectRef iref) const {
// If CheckJNI is performing the checks, we should not reach this point with an invalid
// reference with the exception of gtests that intercept the CheckJNI abort and proceed
// to decode the reference anyway and we do not want to abort again in this case.
if (kIsDebugBuild && !IsCheckJniEnabled()) {
std::string error_msg;
CHECK(IsValidReference(iref, &error_msg)) << error_msg;
}
}
inline ObjPtr<mirror::Object> LocalReferenceTable::Get(IndirectRef iref) const {
DCheckValidReference(iref);
return ToLrtEntry(iref)->GetReference();
}
inline void LocalReferenceTable::Update(IndirectRef iref, ObjPtr<mirror::Object> obj) {
DCheckValidReference(iref);
ToLrtEntry(iref)->SetReference(obj);
}
} // namespace jni
} // namespace art
#endif // ART_RUNTIME_JNI_LOCAL_REFERENCE_TABLE_INL_H_
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