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/*
* Copyright (C) 2015 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.
*/
#include "class_table.h"
#include "mirror/class-inl.h"
namespace art {
ClassTable::ClassTable() : lock_("Class loader classes", kClassLoaderClassesLock) {
Runtime* const runtime = Runtime::Current();
classes_.push_back(ClassSet(runtime->GetHashTableMinLoadFactor(),
runtime->GetHashTableMaxLoadFactor()));
}
void ClassTable::FreezeSnapshot() {
WriterMutexLock mu(Thread::Current(), lock_);
classes_.push_back(ClassSet());
}
bool ClassTable::Contains(mirror::Class* klass) {
ReaderMutexLock mu(Thread::Current(), lock_);
for (ClassSet& class_set : classes_) {
auto it = class_set.Find(GcRoot<mirror::Class>(klass));
if (it != class_set.end()) {
return it->Read() == klass;
}
}
return false;
}
mirror::Class* ClassTable::LookupByDescriptor(mirror::Class* klass) {
ReaderMutexLock mu(Thread::Current(), lock_);
for (ClassSet& class_set : classes_) {
auto it = class_set.Find(GcRoot<mirror::Class>(klass));
if (it != class_set.end()) {
return it->Read();
}
}
return nullptr;
}
// Bug: http://b/31104323 Ignore -Wunreachable-code from the for loop below
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunreachable-code"
mirror::Class* ClassTable::UpdateClass(const char* descriptor, mirror::Class* klass, size_t hash) {
WriterMutexLock mu(Thread::Current(), lock_);
// Should only be updating latest table.
auto existing_it = classes_.back().FindWithHash(descriptor, hash);
if (kIsDebugBuild && existing_it == classes_.back().end()) {
for (const ClassSet& class_set : classes_) {
if (class_set.FindWithHash(descriptor, hash) != class_set.end()) {
LOG(FATAL) << "Updating class found in frozen table " << descriptor;
}
}
LOG(FATAL) << "Updating class not found " << descriptor;
}
mirror::Class* const existing = existing_it->Read();
CHECK_NE(existing, klass) << descriptor;
CHECK(!existing->IsResolved()) << descriptor;
CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor;
CHECK(!klass->IsTemp()) << descriptor;
VerifyObject(klass);
// Update the element in the hash set with the new class. This is safe to do since the descriptor
// doesn't change.
*existing_it = GcRoot<mirror::Class>(klass);
return existing;
}
#pragma clang diagnostic pop // http://b/31104323
size_t ClassTable::NumZygoteClasses() const {
ReaderMutexLock mu(Thread::Current(), lock_);
size_t sum = 0;
for (size_t i = 0; i < classes_.size() - 1; ++i) {
sum += classes_[i].Size();
}
return sum;
}
size_t ClassTable::NumNonZygoteClasses() const {
ReaderMutexLock mu(Thread::Current(), lock_);
return classes_.back().Size();
}
mirror::Class* ClassTable::Lookup(const char* descriptor, size_t hash) {
ReaderMutexLock mu(Thread::Current(), lock_);
for (ClassSet& class_set : classes_) {
auto it = class_set.FindWithHash(descriptor, hash);
if (it != class_set.end()) {
return it->Read();
}
}
return nullptr;
}
void ClassTable::Insert(mirror::Class* klass) {
WriterMutexLock mu(Thread::Current(), lock_);
classes_.back().Insert(GcRoot<mirror::Class>(klass));
}
void ClassTable::InsertWithoutLocks(mirror::Class* klass) {
classes_.back().Insert(GcRoot<mirror::Class>(klass));
}
void ClassTable::InsertWithHash(mirror::Class* klass, size_t hash) {
WriterMutexLock mu(Thread::Current(), lock_);
classes_.back().InsertWithHash(GcRoot<mirror::Class>(klass), hash);
}
bool ClassTable::Remove(const char* descriptor) {
WriterMutexLock mu(Thread::Current(), lock_);
for (ClassSet& class_set : classes_) {
auto it = class_set.Find(descriptor);
if (it != class_set.end()) {
class_set.Erase(it);
return true;
}
}
return false;
}
uint32_t ClassTable::ClassDescriptorHashEquals::operator()(const GcRoot<mirror::Class>& root)
const {
std::string temp;
return ComputeModifiedUtf8Hash(root.Read()->GetDescriptor(&temp));
}
bool ClassTable::ClassDescriptorHashEquals::operator()(const GcRoot<mirror::Class>& a,
const GcRoot<mirror::Class>& b) const {
DCHECK_EQ(a.Read()->GetClassLoader(), b.Read()->GetClassLoader());
std::string temp;
return a.Read()->DescriptorEquals(b.Read()->GetDescriptor(&temp));
}
bool ClassTable::ClassDescriptorHashEquals::operator()(const GcRoot<mirror::Class>& a,
const char* descriptor) const {
return a.Read()->DescriptorEquals(descriptor);
}
uint32_t ClassTable::ClassDescriptorHashEquals::operator()(const char* descriptor) const {
return ComputeModifiedUtf8Hash(descriptor);
}
bool ClassTable::InsertStrongRoot(mirror::Object* obj) {
WriterMutexLock mu(Thread::Current(), lock_);
DCHECK(obj != nullptr);
for (GcRoot<mirror::Object>& root : strong_roots_) {
if (root.Read() == obj) {
return false;
}
}
strong_roots_.push_back(GcRoot<mirror::Object>(obj));
// If `obj` is a dex cache associated with a new oat file with GC roots, add it to oat_files_.
if (obj->IsDexCache()) {
const DexFile* dex_file = down_cast<mirror::DexCache*>(obj)->GetDexFile();
if (dex_file != nullptr && dex_file->GetOatDexFile() != nullptr) {
const OatFile* oat_file = dex_file->GetOatDexFile()->GetOatFile();
if (!oat_file->GetBssGcRoots().empty() && !ContainsElement(oat_files_, oat_file)) {
oat_files_.push_back(oat_file);
}
}
}
return true;
}
size_t ClassTable::WriteToMemory(uint8_t* ptr) const {
ReaderMutexLock mu(Thread::Current(), lock_);
ClassSet combined;
// Combine all the class sets in case there are multiple, also adjusts load factor back to
// default in case classes were pruned.
for (const ClassSet& class_set : classes_) {
for (const GcRoot<mirror::Class>& root : class_set) {
combined.Insert(root);
}
}
const size_t ret = combined.WriteToMemory(ptr);
// Sanity check.
if (kIsDebugBuild && ptr != nullptr) {
size_t read_count;
ClassSet class_set(ptr, /*make copy*/false, &read_count);
class_set.Verify();
}
return ret;
}
size_t ClassTable::ReadFromMemory(uint8_t* ptr) {
size_t read_count = 0;
AddClassSet(ClassSet(ptr, /*make copy*/false, &read_count));
return read_count;
}
void ClassTable::AddClassSet(ClassSet&& set) {
WriterMutexLock mu(Thread::Current(), lock_);
classes_.insert(classes_.begin(), std::move(set));
}
void ClassTable::ClearStrongRoots() {
WriterMutexLock mu(Thread::Current(), lock_);
oat_files_.clear();
strong_roots_.clear();
}
} // namespace art
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