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/*
* Copyright (C) 2013 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_JDWP_OBJECT_REGISTRY_H_
#define ART_RUNTIME_JDWP_OBJECT_REGISTRY_H_
#include <jni.h>
#include <stdint.h>
#include <map>
#include "base/casts.h"
#include "handle.h"
#include "jdwp/jdwp.h"
#include "safe_map.h"
namespace art {
namespace mirror {
class Object;
class Class;
} // namespace mirror
struct ObjectRegistryEntry {
// Is jni_reference a weak global or a regular global reference?
jobjectRefType jni_reference_type;
// The reference itself.
jobject jni_reference;
// A reference count, so we can implement DisposeObject.
int32_t reference_count;
// The corresponding id, so we only need one map lookup in Add.
JDWP::ObjectId id;
// The identity hash code of the object. This is the same as the key
// for object_to_entry_. Store this for DisposeObject().
int32_t identity_hash_code;
};
std::ostream& operator<<(std::ostream& os, const ObjectRegistryEntry& rhs);
// Tracks those objects currently known to the debugger, so we can use consistent ids when
// referring to them. Normally we keep JNI weak global references to objects, so they can
// still be garbage collected. The debugger can ask us to retain objects, though, so we can
// also promote references to regular JNI global references (and demote them back again if
// the debugger tells us that's okay).
class ObjectRegistry {
public:
ObjectRegistry();
JDWP::ObjectId Add(mirror::Object* o)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_)
LOCKS_EXCLUDED(Locks::thread_list_lock_,
Locks::thread_suspend_count_lock_);
JDWP::RefTypeId AddRefType(mirror::Class* c)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_)
LOCKS_EXCLUDED(Locks::thread_list_lock_,
Locks::thread_suspend_count_lock_);
template<class T>
JDWP::ObjectId Add(Handle<T> obj_h)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_)
LOCKS_EXCLUDED(Locks::thread_list_lock_,
Locks::thread_suspend_count_lock_);
JDWP::RefTypeId AddRefType(Handle<mirror::Class> c_h)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_)
LOCKS_EXCLUDED(Locks::thread_list_lock_,
Locks::thread_suspend_count_lock_);
template<typename T> T Get(JDWP::ObjectId id, JDWP::JdwpError* error)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
if (id == 0) {
*error = JDWP::ERR_NONE;
return nullptr;
}
return down_cast<T>(InternalGet(id, error));
}
void Clear() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void DisableCollection(JDWP::ObjectId id)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) LOCKS_EXCLUDED(lock_);
void EnableCollection(JDWP::ObjectId id)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) LOCKS_EXCLUDED(lock_);
bool IsCollected(JDWP::ObjectId id)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) LOCKS_EXCLUDED(lock_);
void DisposeObject(JDWP::ObjectId id, uint32_t reference_count)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// This is needed to get the jobject instead of the Object*.
// Avoid using this and use standard Get when possible.
jobject GetJObject(JDWP::ObjectId id) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
private:
template<class T>
JDWP::ObjectId InternalAdd(Handle<T> obj_h)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_)
LOCKS_EXCLUDED(lock_,
Locks::thread_list_lock_,
Locks::thread_suspend_count_lock_);
mirror::Object* InternalGet(JDWP::ObjectId id, JDWP::JdwpError* error)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_)
LOCKS_EXCLUDED(lock_);
void Demote(ObjectRegistryEntry& entry)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_)
EXCLUSIVE_LOCKS_REQUIRED(lock_);
void Promote(ObjectRegistryEntry& entry)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_)
EXCLUSIVE_LOCKS_REQUIRED(lock_);
bool ContainsLocked(Thread* self, mirror::Object* o, int32_t identity_hash_code,
ObjectRegistryEntry** out_entry)
EXCLUSIVE_LOCKS_REQUIRED(lock_) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
Mutex lock_ DEFAULT_MUTEX_ACQUIRED_AFTER;
std::multimap<int32_t, ObjectRegistryEntry*> object_to_entry_ GUARDED_BY(lock_);
SafeMap<JDWP::ObjectId, ObjectRegistryEntry*> id_to_entry_ GUARDED_BY(lock_);
size_t next_id_ GUARDED_BY(lock_);
};
} // namespace art
#endif // ART_RUNTIME_JDWP_OBJECT_REGISTRY_H_
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