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/*
* Copyright (C) 2011 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_GC_COLLECTOR_MARK_SWEEP_INL_H_
#define ART_RUNTIME_GC_COLLECTOR_MARK_SWEEP_INL_H_
#include "gc/collector/mark_sweep.h"
#include "gc/heap.h"
#include "mirror/class.h"
#include "mirror/field.h"
#include "mirror/object_array.h"
namespace art {
namespace gc {
namespace collector {
template <typename MarkVisitor>
inline void MarkSweep::ScanObjectVisit(const mirror::Object* obj, const MarkVisitor& visitor) {
DCHECK(obj != NULL);
if (kIsDebugBuild && !IsMarked(obj)) {
heap_->DumpSpaces();
LOG(FATAL) << "Scanning unmarked object " << obj;
}
mirror::Class* klass = obj->GetClass();
DCHECK(klass != NULL);
if (klass == java_lang_Class_) {
DCHECK_EQ(klass->GetClass(), java_lang_Class_);
if (kCountScannedTypes) {
++class_count_;
}
VisitClassReferences(klass, obj, visitor);
} else if (klass->IsArrayClass()) {
if (kCountScannedTypes) {
++array_count_;
}
visitor(obj, klass, mirror::Object::ClassOffset(), false);
if (klass->IsObjectArrayClass()) {
VisitObjectArrayReferences(obj->AsObjectArray<mirror::Object>(), visitor);
}
} else {
if (kCountScannedTypes) {
++other_count_;
}
VisitOtherReferences(klass, obj, visitor);
if (UNLIKELY(klass->IsReferenceClass())) {
DelayReferenceReferent(const_cast<mirror::Object*>(obj));
}
}
}
template <typename Visitor>
inline void MarkSweep::VisitObjectReferences(const mirror::Object* obj, const Visitor& visitor)
SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_,
Locks::mutator_lock_) {
DCHECK(obj != NULL);
DCHECK(obj->GetClass() != NULL);
mirror::Class* klass = obj->GetClass();
DCHECK(klass != NULL);
if (klass == mirror::Class::GetJavaLangClass()) {
DCHECK_EQ(klass->GetClass(), mirror::Class::GetJavaLangClass());
VisitClassReferences(klass, obj, visitor);
} else {
if (klass->IsArrayClass()) {
visitor(obj, klass, mirror::Object::ClassOffset(), false);
if (klass->IsObjectArrayClass()) {
VisitObjectArrayReferences(obj->AsObjectArray<mirror::Object>(), visitor);
}
} else {
VisitOtherReferences(klass, obj, visitor);
}
}
}
template <typename Visitor>
inline void MarkSweep::VisitInstanceFieldsReferences(const mirror::Class* klass,
const mirror::Object* obj,
const Visitor& visitor)
SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_, Locks::mutator_lock_) {
DCHECK(obj != NULL);
DCHECK(klass != NULL);
VisitFieldsReferences(obj, klass->GetReferenceInstanceOffsets(), false, visitor);
}
template <typename Visitor>
inline void MarkSweep::VisitClassReferences(const mirror::Class* klass, const mirror::Object* obj,
const Visitor& visitor)
SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_, Locks::mutator_lock_) {
VisitInstanceFieldsReferences(klass, obj, visitor);
VisitStaticFieldsReferences(obj->AsClass(), visitor);
}
template <typename Visitor>
inline void MarkSweep::VisitStaticFieldsReferences(const mirror::Class* klass,
const Visitor& visitor)
SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_, Locks::mutator_lock_) {
DCHECK(klass != NULL);
VisitFieldsReferences(klass, klass->GetReferenceStaticOffsets(), true, visitor);
}
template <typename Visitor>
inline void MarkSweep::VisitFieldsReferences(const mirror::Object* obj, uint32_t ref_offsets,
bool is_static, const Visitor& visitor) {
if (LIKELY(ref_offsets != CLASS_WALK_SUPER)) {
// Found a reference offset bitmap. Mark the specified offsets.
while (ref_offsets != 0) {
size_t right_shift = CLZ(ref_offsets);
MemberOffset field_offset = CLASS_OFFSET_FROM_CLZ(right_shift);
const mirror::Object* ref = obj->GetFieldObject<const mirror::Object*>(field_offset, false);
visitor(obj, ref, field_offset, is_static);
ref_offsets &= ~(CLASS_HIGH_BIT >> right_shift);
}
} else {
// There is no reference offset bitmap. In the non-static case,
// walk up the class inheritance hierarchy and find reference
// offsets the hard way. In the static case, just consider this
// class.
for (const mirror::Class* klass = is_static ? obj->AsClass() : obj->GetClass();
klass != NULL;
klass = is_static ? NULL : klass->GetSuperClass()) {
size_t num_reference_fields = (is_static
? klass->NumReferenceStaticFields()
: klass->NumReferenceInstanceFields());
for (size_t i = 0; i < num_reference_fields; ++i) {
mirror::Field* field = (is_static ? klass->GetStaticField(i)
: klass->GetInstanceField(i));
MemberOffset field_offset = field->GetOffset();
const mirror::Object* ref = obj->GetFieldObject<const mirror::Object*>(field_offset, false);
visitor(obj, ref, field_offset, is_static);
}
}
}
}
template <typename Visitor>
inline void MarkSweep::VisitObjectArrayReferences(const mirror::ObjectArray<mirror::Object>* array,
const Visitor& visitor) {
const int32_t length = array->GetLength();
for (int32_t i = 0; i < length; ++i) {
const mirror::Object* element = array->GetWithoutChecks(i);
const size_t width = sizeof(mirror::Object*);
MemberOffset offset = MemberOffset(i * width + mirror::Array::DataOffset(width).Int32Value());
visitor(array, element, offset, false);
}
}
} // namespace collector
} // namespace gc
} // namespace art
#endif // ART_RUNTIME_GC_COLLECTOR_MARK_SWEEP_INL_H_
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