/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "intrinsic_objects.h"
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#include "art_field-inl.h"
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#include "base/logging.h"
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#include "class_root.h"
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#include "handle.h"
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#include "obj_ptr-inl.h"
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#include "mirror/object_array-alloc-inl.h"
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#include "mirror/object_array-inl.h"
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namespace art {
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static ObjPtr<mirror::ObjectArray<mirror::Object>> LookupIntegerCache(Thread* self,
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ClassLinker* class_linker)
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REQUIRES_SHARED(Locks::mutator_lock_) {
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ObjPtr<mirror::Class> integer_cache_class = class_linker->LookupClass(
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self, "Ljava/lang/Integer$IntegerCache;", /* class_loader= */ nullptr);
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if (integer_cache_class == nullptr || !integer_cache_class->IsInitialized()) {
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return nullptr;
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}
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ArtField* cache_field =
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integer_cache_class->FindDeclaredStaticField("cache", "[Ljava/lang/Integer;");
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CHECK(cache_field != nullptr);
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ObjPtr<mirror::ObjectArray<mirror::Object>> integer_cache =
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ObjPtr<mirror::ObjectArray<mirror::Object>>::DownCast(
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cache_field->GetObject(integer_cache_class));
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CHECK(integer_cache != nullptr);
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return integer_cache;
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}
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ObjPtr<mirror::ObjectArray<mirror::Object>> IntrinsicObjects::AllocateBootImageLiveObjects(
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Thread* self,
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ClassLinker* class_linker) REQUIRES_SHARED(Locks::mutator_lock_) {
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// The objects used for the Integer.valueOf() intrinsic must remain live even if references
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// to them are removed using reflection. Image roots are not accessible through reflection,
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// so the array we construct here shall keep them alive.
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StackHandleScope<1> hs(self);
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Handle<mirror::ObjectArray<mirror::Object>> integer_cache =
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hs.NewHandle(LookupIntegerCache(self, class_linker));
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size_t live_objects_size =
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(integer_cache != nullptr) ? (/* cache */ 1u + integer_cache->GetLength()) : 0u;
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ObjPtr<mirror::ObjectArray<mirror::Object>> live_objects =
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mirror::ObjectArray<mirror::Object>::Alloc(
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self, GetClassRoot<mirror::ObjectArray<mirror::Object>>(class_linker), live_objects_size);
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int32_t index = 0;
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if (integer_cache != nullptr) {
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live_objects->Set(index++, integer_cache.Get());
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for (int32_t i = 0, length = integer_cache->GetLength(); i != length; ++i) {
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live_objects->Set(index++, integer_cache->Get(i));
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}
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}
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CHECK_EQ(index, live_objects->GetLength());
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if (kIsDebugBuild && integer_cache != nullptr) {
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CHECK_EQ(integer_cache.Get(), GetIntegerValueOfCache(live_objects));
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for (int32_t i = 0, len = integer_cache->GetLength(); i != len; ++i) {
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CHECK_EQ(integer_cache->GetWithoutChecks(i), GetIntegerValueOfObject(live_objects, i));
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}
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}
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return live_objects;
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}
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ObjPtr<mirror::ObjectArray<mirror::Object>> IntrinsicObjects::GetIntegerValueOfCache(
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ObjPtr<mirror::ObjectArray<mirror::Object>> boot_image_live_objects) {
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DCHECK(boot_image_live_objects != nullptr);
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if (boot_image_live_objects->GetLength() == 0u) {
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return nullptr; // No intrinsic objects.
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}
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// No need for read barrier for boot image object or for verifying the value that was just stored.
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ObjPtr<mirror::Object> result =
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boot_image_live_objects->GetWithoutChecks<kVerifyNone, kWithoutReadBarrier>(0);
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DCHECK(result != nullptr);
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DCHECK(result->IsObjectArray());
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DCHECK(result->GetClass()->DescriptorEquals("[Ljava/lang/Integer;"));
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return ObjPtr<mirror::ObjectArray<mirror::Object>>::DownCast(result);
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}
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ObjPtr<mirror::Object> IntrinsicObjects::GetIntegerValueOfObject(
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ObjPtr<mirror::ObjectArray<mirror::Object>> boot_image_live_objects,
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uint32_t index) {
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DCHECK(boot_image_live_objects != nullptr);
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DCHECK_NE(boot_image_live_objects->GetLength(), 0);
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DCHECK_LT(index,
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static_cast<uint32_t>(GetIntegerValueOfCache(boot_image_live_objects)->GetLength()));
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// No need for read barrier for boot image object or for verifying the value that was just stored.
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ObjPtr<mirror::Object> result =
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boot_image_live_objects->GetWithoutChecks<kVerifyNone, kWithoutReadBarrier>(
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/* skip the IntegerCache.cache */ 1u + index);
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DCHECK(result != nullptr);
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DCHECK(result->GetClass()->DescriptorEquals("Ljava/lang/Integer;"));
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return result;
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}
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MemberOffset IntrinsicObjects::GetIntegerValueOfArrayDataOffset(
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ObjPtr<mirror::ObjectArray<mirror::Object>> boot_image_live_objects) {
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DCHECK_NE(boot_image_live_objects->GetLength(), 0);
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MemberOffset result = mirror::ObjectArray<mirror::Object>::OffsetOfElement(1u);
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DCHECK_EQ(GetIntegerValueOfObject(boot_image_live_objects, 0u),
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(boot_image_live_objects
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->GetFieldObject<mirror::Object, kVerifyNone, kWithoutReadBarrier>(result)));
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return result;
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}
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} // namespace art
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