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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 "class_linker.h"
#include "gc/heap-inl.h"
#include "mirror/art_field.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 bool ClassLinker::IsInBootClassPath(const char* descriptor) {
DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_);
return pair.second != nullptr;
}
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 = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(
&find_array_class_cache_[i]);
if (array_class != nullptr && array_class->GetComponentType() == *element_class) {
return array_class;
}
}
DCHECK(!(*element_class)->IsPrimitiveVoid());
std::string descriptor = "[" + (*element_class)->GetDescriptor();
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] = array_class;
find_array_class_cache_next_victim_ = (victim_index + 1) % kFindArrayCacheSize;
return array_class;
}
inline mirror::String* ClassLinker::ResolveString(uint32_t string_idx,
mirror::ArtMethod* referrer) {
mirror::String* resolved_string = referrer->GetDexCacheStrings()->Get(string_idx);
if (UNLIKELY(resolved_string == NULL)) {
mirror::Class* declaring_class = referrer->GetDeclaringClass();
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,
mirror::ArtMethod* referrer) {
mirror::Class* resolved_type = referrer->GetDexCacheResolvedTypes()->Get(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);
if (resolved_type != nullptr) {
DCHECK_EQ(dex_cache->GetResolvedType(type_idx), resolved_type);
}
}
return resolved_type;
}
inline mirror::Class* ClassLinker::ResolveType(uint16_t type_idx, mirror::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 == NULL)) {
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);
if (resolved_type != nullptr) {
DCHECK_EQ(dex_cache->GetResolvedType(type_idx), resolved_type);
}
}
return resolved_type;
}
inline mirror::ArtMethod* ClassLinker::GetResolvedMethod(uint32_t method_idx,
mirror::ArtMethod* referrer,
InvokeType type) {
mirror::ArtMethod* resolved_method =
referrer->GetDexCacheResolvedMethods()->Get(method_idx);
if (resolved_method == nullptr || resolved_method->IsRuntimeMethod()) {
return nullptr;
}
return resolved_method;
}
inline mirror::ArtMethod* ClassLinker::ResolveMethod(Thread* self, uint32_t method_idx,
mirror::ArtMethod** referrer,
InvokeType type) {
mirror::ArtMethod* resolved_method = GetResolvedMethod(method_idx, *referrer, type);
if (LIKELY(resolved_method != nullptr)) {
return resolved_method;
}
mirror::Class* declaring_class = (*referrer)->GetDeclaringClass();
StackHandleScope<3> hs(self);
Handle<mirror::DexCache> h_dex_cache(hs.NewHandle(declaring_class->GetDexCache()));
Handle<mirror::ClassLoader> h_class_loader(hs.NewHandle(declaring_class->GetClassLoader()));
HandleWrapper<mirror::ArtMethod> h_referrer(hs.NewHandleWrapper(referrer));
const DexFile* dex_file = h_dex_cache->GetDexFile();
resolved_method = ResolveMethod(*dex_file, method_idx, h_dex_cache, h_class_loader, h_referrer,
type);
if (resolved_method != nullptr) {
DCHECK_EQ(h_dex_cache->GetResolvedMethod(method_idx), resolved_method);
}
return resolved_method;
}
inline mirror::ArtField* ClassLinker::GetResolvedField(uint32_t field_idx,
mirror::Class* field_declaring_class) {
return field_declaring_class->GetDexCache()->GetResolvedField(field_idx);
}
inline mirror::ArtField* ClassLinker::ResolveField(uint32_t field_idx, mirror::ArtMethod* referrer,
bool is_static) {
mirror::Class* declaring_class = referrer->GetDeclaringClass();
mirror::ArtField* resolved_field = GetResolvedField(field_idx, declaring_class);
if (UNLIKELY(resolved_field == NULL)) {
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);
if (resolved_field != nullptr) {
DCHECK_EQ(dex_cache->GetResolvedField(field_idx), resolved_field);
}
}
return resolved_field;
}
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::ObjectArray<mirror::ArtMethod>* ClassLinker::AllocArtMethodArray(Thread* self,
size_t length) {
return mirror::ObjectArray<mirror::ArtMethod>::Alloc(self,
GetClassRoot(kJavaLangReflectArtMethodArrayClass), 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::ObjectArray<mirror::ArtField>* ClassLinker::AllocArtFieldArray(Thread* self,
size_t length) {
gc::Heap* const heap = Runtime::Current()->GetHeap();
// Can't have movable field arrays for mark compact since we need these arrays to always be valid
// so that we can do Object::VisitReferences in the case where the fields don't fit in the
// reference offsets word.
return mirror::ObjectArray<mirror::ArtField>::Alloc(
self, GetClassRoot(kJavaLangReflectArtFieldArrayClass), length,
kMoveFieldArrays ? heap->GetCurrentAllocator() : heap->GetCurrentNonMovingAllocator());
}
inline mirror::Class* ClassLinker::GetClassRoot(ClassRoot class_root)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
DCHECK(class_roots_ != NULL);
mirror::ObjectArray<mirror::Class>* class_roots =
ReadBarrier::BarrierForRoot<mirror::ObjectArray<mirror::Class>, kWithReadBarrier>(
&class_roots_);
mirror::Class* klass = class_roots->Get(class_root);
DCHECK(klass != NULL);
return klass;
}
inline mirror::DexCache* ClassLinker::GetDexCache(size_t idx) {
dex_lock_.AssertSharedHeld(Thread::Current());
DCHECK(idx < dex_caches_.size());
return ReadBarrier::BarrierForRoot<mirror::DexCache, kWithReadBarrier>(&dex_caches_[idx]);
}
} // namespace art
#endif // ART_RUNTIME_CLASS_LINKER_INL_H_