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/*
* Copyright (C) 2016 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_ext.h"
#include "art_method-inl.h"
#include "base/casts.h"
#include "base/enums.h"
#include "class-inl.h"
#include "dex_file-inl.h"
#include "gc/accounting/card_table-inl.h"
#include "object-inl.h"
#include "object_array.h"
#include "object_array-inl.h"
#include "stack_trace_element.h"
#include "utils.h"
#include "well_known_classes.h"
namespace art {
namespace mirror {
GcRoot<Class> ClassExt::dalvik_system_ClassExt_;
void ClassExt::SetObsoleteArrays(ObjPtr<PointerArray> methods,
ObjPtr<ObjectArray<DexCache>> dex_caches) {
DCHECK_EQ(GetLockOwnerThreadId(), Thread::Current()->GetThreadId())
<< "Obsolete arrays are set without synchronization!";
CHECK_EQ(methods.IsNull(), dex_caches.IsNull());
auto obsolete_dex_cache_off = OFFSET_OF_OBJECT_MEMBER(ClassExt, obsolete_dex_caches_);
auto obsolete_methods_off = OFFSET_OF_OBJECT_MEMBER(ClassExt, obsolete_methods_);
DCHECK(!Runtime::Current()->IsActiveTransaction());
SetFieldObject<false>(obsolete_dex_cache_off, dex_caches.Ptr());
SetFieldObject<false>(obsolete_methods_off, methods.Ptr());
}
// We really need to be careful how we update this. If we ever in the future make it so that
// these arrays are written into without all threads being suspended we have a race condition! This
// race could cause obsolete methods to be missed.
bool ClassExt::ExtendObsoleteArrays(Thread* self, uint32_t increase) {
DCHECK_EQ(GetLockOwnerThreadId(), Thread::Current()->GetThreadId())
<< "Obsolete arrays are set without synchronization!";
StackHandleScope<5> hs(self);
Handle<ClassExt> h_this(hs.NewHandle(this));
Handle<PointerArray> old_methods(hs.NewHandle(h_this->GetObsoleteMethods()));
Handle<ObjectArray<DexCache>> old_dex_caches(hs.NewHandle(h_this->GetObsoleteDexCaches()));
ClassLinker* cl = Runtime::Current()->GetClassLinker();
size_t new_len;
if (old_methods.Get() == nullptr) {
CHECK(old_dex_caches.Get() == nullptr);
new_len = increase;
} else {
CHECK_EQ(old_methods->GetLength(), old_dex_caches->GetLength());
new_len = increase + old_methods->GetLength();
}
Handle<PointerArray> new_methods(hs.NewHandle<PointerArray>(
cl->AllocPointerArray(self, new_len)));
if (new_methods.IsNull()) {
// Fail.
self->AssertPendingOOMException();
return false;
}
Handle<ObjectArray<DexCache>> new_dex_caches(hs.NewHandle<ObjectArray<DexCache>>(
ObjectArray<DexCache>::Alloc(self,
cl->FindClass(self,
"[Ljava/lang/DexCache;",
ScopedNullHandle<ClassLoader>()),
new_len)));
if (new_dex_caches.IsNull()) {
// Fail.
self->AssertPendingOOMException();
return false;
}
if (!old_methods.IsNull()) {
// Copy the old contents.
new_methods->Memcpy(0,
old_methods.Get(),
0,
old_methods->GetLength(),
cl->GetImagePointerSize());
new_dex_caches->AsObjectArray<Object>()->AssignableCheckingMemcpy<false>(
0, old_dex_caches->AsObjectArray<Object>(), 0, old_dex_caches->GetLength(), false);
}
// Set the fields.
h_this->SetObsoleteArrays(new_methods.Get(), new_dex_caches.Get());
return true;
}
ClassExt* ClassExt::Alloc(Thread* self) {
DCHECK(dalvik_system_ClassExt_.Read() != nullptr);
return down_cast<ClassExt*>(dalvik_system_ClassExt_.Read()->AllocObject(self).Ptr());
}
void ClassExt::SetVerifyError(ObjPtr<Object> err) {
if (Runtime::Current()->IsActiveTransaction()) {
SetFieldObject<true>(OFFSET_OF_OBJECT_MEMBER(ClassExt, verify_error_), err);
} else {
SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(ClassExt, verify_error_), err);
}
}
void ClassExt::SetClass(ObjPtr<Class> dalvik_system_ClassExt) {
CHECK(dalvik_system_ClassExt != nullptr);
dalvik_system_ClassExt_ = GcRoot<Class>(dalvik_system_ClassExt);
}
void ClassExt::ResetClass() {
CHECK(!dalvik_system_ClassExt_.IsNull());
dalvik_system_ClassExt_ = GcRoot<Class>(nullptr);
}
void ClassExt::VisitRoots(RootVisitor* visitor) {
dalvik_system_ClassExt_.VisitRootIfNonNull(visitor, RootInfo(kRootStickyClass));
}
} // namespace mirror
} // namespace art
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