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/*
* Copyright (C) 2018 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 "intrinsic_objects.h"
#include "art_field-inl.h"
#include "base/casts.h"
#include "base/logging.h"
#include "image.h"
#include "obj_ptr-inl.h"
namespace art HIDDEN {
static constexpr size_t kIntrinsicObjectsOffset =
enum_cast<size_t>(ImageHeader::kIntrinsicObjectsStart);
ObjPtr<mirror::ObjectArray<mirror::Object>> IntrinsicObjects::LookupIntegerCache(
Thread* self, ClassLinker* class_linker) {
ObjPtr<mirror::Class> integer_cache_class = class_linker->LookupClass(
self, "Ljava/lang/Integer$IntegerCache;", /* class_loader= */ nullptr);
if (integer_cache_class == nullptr || !integer_cache_class->IsInitialized()) {
return nullptr;
}
ArtField* cache_field =
integer_cache_class->FindDeclaredStaticField("cache", "[Ljava/lang/Integer;");
CHECK(cache_field != nullptr);
ObjPtr<mirror::ObjectArray<mirror::Object>> integer_cache =
ObjPtr<mirror::ObjectArray<mirror::Object>>::DownCast(
cache_field->GetObject(integer_cache_class));
CHECK(integer_cache != nullptr);
return integer_cache;
}
static bool HasIntrinsicObjects(
ObjPtr<mirror::ObjectArray<mirror::Object>> boot_image_live_objects)
REQUIRES_SHARED(Locks::mutator_lock_) {
DCHECK(boot_image_live_objects != nullptr);
uint32_t length = static_cast<uint32_t>(boot_image_live_objects->GetLength());
DCHECK_GE(length, kIntrinsicObjectsOffset);
return length != kIntrinsicObjectsOffset;
}
ObjPtr<mirror::ObjectArray<mirror::Object>> IntrinsicObjects::GetIntegerValueOfCache(
ObjPtr<mirror::ObjectArray<mirror::Object>> boot_image_live_objects) {
if (!HasIntrinsicObjects(boot_image_live_objects)) {
return nullptr; // No intrinsic objects.
}
// No need for read barrier for boot image object or for verifying the value that was just stored.
ObjPtr<mirror::Object> result =
boot_image_live_objects->GetWithoutChecks<kVerifyNone, kWithoutReadBarrier>(
kIntrinsicObjectsOffset);
DCHECK(result != nullptr);
DCHECK(result->IsObjectArray());
DCHECK(result->GetClass()->DescriptorEquals("[Ljava/lang/Integer;"));
return ObjPtr<mirror::ObjectArray<mirror::Object>>::DownCast(result);
}
ObjPtr<mirror::Object> IntrinsicObjects::GetIntegerValueOfObject(
ObjPtr<mirror::ObjectArray<mirror::Object>> boot_image_live_objects,
uint32_t index) {
DCHECK(HasIntrinsicObjects(boot_image_live_objects));
DCHECK_LT(index,
static_cast<uint32_t>(GetIntegerValueOfCache(boot_image_live_objects)->GetLength()));
// No need for read barrier for boot image object or for verifying the value that was just stored.
ObjPtr<mirror::Object> result =
boot_image_live_objects->GetWithoutChecks<kVerifyNone, kWithoutReadBarrier>(
kIntrinsicObjectsOffset + /* skip the IntegerCache.cache */ 1u + index);
DCHECK(result != nullptr);
DCHECK(result->GetClass()->DescriptorEquals("Ljava/lang/Integer;"));
return result;
}
MemberOffset IntrinsicObjects::GetIntegerValueOfArrayDataOffset(
ObjPtr<mirror::ObjectArray<mirror::Object>> boot_image_live_objects) {
DCHECK(HasIntrinsicObjects(boot_image_live_objects));
MemberOffset result =
mirror::ObjectArray<mirror::Object>::OffsetOfElement(kIntrinsicObjectsOffset + 1u);
DCHECK_EQ(GetIntegerValueOfObject(boot_image_live_objects, 0u),
(boot_image_live_objects
->GetFieldObject<mirror::Object, kVerifyNone, kWithoutReadBarrier>(result)));
return result;
}
} // namespace art
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