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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_CLASS_LINKER_INL_H_
#define ART_RUNTIME_CLASS_LINKER_INL_H_
#include "art_field.h"
#include "class_linker.h"
#include "gc_root-inl.h"
#include "gc/heap-inl.h"
#include "mirror/class_loader.h"
#include "mirror/dex_cache-inl.h"
#include "mirror/iftable.h"
#include "mirror/object_array.h"
#include "handle_scope-inl.h"
namespace art {
inline mirror::Class* ClassLinker::FindSystemClass(Thread* self, const char* descriptor) {
return FindClass(self, descriptor, NullHandle<mirror::ClassLoader>());
}
inline mirror::Class* ClassLinker::FindArrayClass(Thread* self, mirror::Class** element_class) {
for (size_t i = 0; i < kFindArrayCacheSize; ++i) {
// Read the cached array class once to avoid races with other threads setting it.
mirror::Class* array_class = find_array_class_cache_[i].Read();
if (array_class != nullptr && array_class->GetComponentType() == *element_class) {
return array_class;
}
}
DCHECK(!(*element_class)->IsPrimitiveVoid());
std::string descriptor = "[";
std::string temp;
descriptor += (*element_class)->GetDescriptor(&temp);
StackHandleScope<2> hs(Thread::Current());
Handle<mirror::ClassLoader> class_loader(hs.NewHandle((*element_class)->GetClassLoader()));
HandleWrapper<mirror::Class> h_element_class(hs.NewHandleWrapper(element_class));
mirror::Class* array_class = FindClass(self, descriptor.c_str(), class_loader);
// Benign races in storing array class and incrementing index.
size_t victim_index = find_array_class_cache_next_victim_;
find_array_class_cache_[victim_index] = GcRoot<mirror::Class>(array_class);
find_array_class_cache_next_victim_ = (victim_index + 1) % kFindArrayCacheSize;
return array_class;
}
inline mirror::String* ClassLinker::ResolveString(uint32_t string_idx,
ArtMethod* referrer) {
mirror::Class* declaring_class = referrer->GetDeclaringClass();
mirror::String* resolved_string = declaring_class->GetDexCacheStrings()->Get(string_idx);
if (UNLIKELY(resolved_string == nullptr)) {
StackHandleScope<1> hs(Thread::Current());
Handle<mirror::DexCache> dex_cache(hs.NewHandle(declaring_class->GetDexCache()));
const DexFile& dex_file = *dex_cache->GetDexFile();
resolved_string = ResolveString(dex_file, string_idx, dex_cache);
if (resolved_string != nullptr) {
DCHECK_EQ(dex_cache->GetResolvedString(string_idx), resolved_string);
}
}
return resolved_string;
}
inline mirror::Class* ClassLinker::ResolveType(uint16_t type_idx,
ArtMethod* referrer) {
mirror::Class* resolved_type = referrer->GetDexCacheResolvedType(type_idx);
if (UNLIKELY(resolved_type == nullptr)) {
mirror::Class* declaring_class = referrer->GetDeclaringClass();
StackHandleScope<2> hs(Thread::Current());
Handle<mirror::DexCache> dex_cache(hs.NewHandle(declaring_class->GetDexCache()));
Handle<mirror::ClassLoader> class_loader(hs.NewHandle(declaring_class->GetClassLoader()));
const DexFile& dex_file = *dex_cache->GetDexFile();
resolved_type = ResolveType(dex_file, type_idx, dex_cache, class_loader);
// Note: We cannot check here to see whether we added the type to the cache. The type
// might be an erroneous class, which results in it being hidden from us.
}
return resolved_type;
}
inline mirror::Class* ClassLinker::ResolveType(uint16_t type_idx, ArtField* referrer) {
mirror::Class* declaring_class = referrer->GetDeclaringClass();
mirror::DexCache* dex_cache_ptr = declaring_class->GetDexCache();
mirror::Class* resolved_type = dex_cache_ptr->GetResolvedType(type_idx);
if (UNLIKELY(resolved_type == nullptr)) {
StackHandleScope<2> hs(Thread::Current());
Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_cache_ptr));
Handle<mirror::ClassLoader> class_loader(hs.NewHandle(declaring_class->GetClassLoader()));
const DexFile& dex_file = *dex_cache->GetDexFile();
resolved_type = ResolveType(dex_file, type_idx, dex_cache, class_loader);
// Note: We cannot check here to see whether we added the type to the cache. The type
// might be an erroneous class, which results in it being hidden from us.
}
return resolved_type;
}
inline ArtMethod* ClassLinker::GetResolvedMethod(uint32_t method_idx, ArtMethod* referrer) {
ArtMethod* resolved_method = referrer->GetDexCacheResolvedMethod(
method_idx, image_pointer_size_);
if (resolved_method == nullptr || resolved_method->IsRuntimeMethod()) {
return nullptr;
}
return resolved_method;
}
inline ArtMethod* ClassLinker::ResolveMethod(Thread* self, uint32_t method_idx,
ArtMethod* referrer, InvokeType type) {
ArtMethod* resolved_method = GetResolvedMethod(method_idx, referrer);
if (UNLIKELY(resolved_method == nullptr)) {
mirror::Class* declaring_class = referrer->GetDeclaringClass();
StackHandleScope<2> hs(self);
Handle<mirror::DexCache> h_dex_cache(hs.NewHandle(declaring_class->GetDexCache()));
Handle<mirror::ClassLoader> h_class_loader(hs.NewHandle(declaring_class->GetClassLoader()));
const DexFile* dex_file = h_dex_cache->GetDexFile();
resolved_method = ResolveMethod(*dex_file, method_idx, h_dex_cache, h_class_loader, referrer,
type);
}
// Note: We cannot check here to see whether we added the method to the cache. It
// might be an erroneous class, which results in it being hidden from us.
return resolved_method;
}
inline ArtField* ClassLinker::GetResolvedField(uint32_t field_idx, mirror::DexCache* dex_cache) {
return dex_cache->GetResolvedField(field_idx, image_pointer_size_);
}
inline ArtField* ClassLinker::GetResolvedField(
uint32_t field_idx, mirror::Class* field_declaring_class) {
return GetResolvedField(field_idx, field_declaring_class->GetDexCache());
}
inline ArtField* ClassLinker::ResolveField(uint32_t field_idx, ArtMethod* referrer,
bool is_static) {
mirror::Class* declaring_class = referrer->GetDeclaringClass();
ArtField* resolved_field = GetResolvedField(field_idx, declaring_class);
if (UNLIKELY(resolved_field == nullptr)) {
StackHandleScope<2> hs(Thread::Current());
Handle<mirror::DexCache> dex_cache(hs.NewHandle(declaring_class->GetDexCache()));
Handle<mirror::ClassLoader> class_loader(hs.NewHandle(declaring_class->GetClassLoader()));
const DexFile& dex_file = *dex_cache->GetDexFile();
resolved_field = ResolveField(dex_file, field_idx, dex_cache, class_loader, is_static);
// Note: We cannot check here to see whether we added the field to the cache. The type
// might be an erroneous class, which results in it being hidden from us.
}
return resolved_field;
}
inline mirror::Object* ClassLinker::AllocObject(Thread* self) {
return GetClassRoot(kJavaLangObject)->Alloc<true, false>(self,
Runtime::Current()->GetHeap()->GetCurrentAllocator());
}
template <class T>
inline mirror::ObjectArray<T>* ClassLinker::AllocObjectArray(Thread* self, size_t length) {
return mirror::ObjectArray<T>::Alloc(self, GetClassRoot(kObjectArrayClass), length);
}
inline mirror::ObjectArray<mirror::Class>* ClassLinker::AllocClassArray(Thread* self,
size_t length) {
return mirror::ObjectArray<mirror::Class>::Alloc(self, GetClassRoot(kClassArrayClass), length);
}
inline mirror::ObjectArray<mirror::String>* ClassLinker::AllocStringArray(Thread* self,
size_t length) {
return mirror::ObjectArray<mirror::String>::Alloc(self, GetClassRoot(kJavaLangStringArrayClass),
length);
}
inline mirror::IfTable* ClassLinker::AllocIfTable(Thread* self, size_t ifcount) {
return down_cast<mirror::IfTable*>(
mirror::IfTable::Alloc(self, GetClassRoot(kObjectArrayClass),
ifcount * mirror::IfTable::kMax));
}
inline mirror::Class* ClassLinker::GetClassRoot(ClassRoot class_root)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
DCHECK(!class_roots_.IsNull());
mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read();
mirror::Class* klass = class_roots->Get(class_root);
DCHECK(klass != nullptr);
return klass;
}
inline mirror::DexCache* ClassLinker::GetDexCache(size_t idx) {
dex_lock_.AssertSharedHeld(Thread::Current());
DCHECK(idx < dex_caches_.size());
return dex_caches_[idx].Read();
}
} // namespace art
#endif // ART_RUNTIME_CLASS_LINKER_INL_H_
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