runtime/class_linker-inl.h - platform/art - Git at Google

 /*
  * 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_root-inl.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 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,
                                                   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->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, 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);
     // 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::ArtMethod* ClassLinker::GetResolvedMethod(uint32_t method_idx,
                                                          mirror::ArtMethod* referrer,
                                                          InvokeType type) {
   mirror::ArtMethod* resolved_method = referrer->GetDexCacheResolvedMethod(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);
   // 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 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);
     // 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;
 }

 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_.IsNull());
   mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read();
   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 dex_caches_[idx].Read();
 }

 }  // namespace art

 #endif  // ART_RUNTIME_CLASS_LINKER_INL_H_
	/*
	* 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_root-inl.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 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,
	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->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, 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);
	// 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::ArtMethod* ClassLinker::GetResolvedMethod(uint32_t method_idx,
	mirror::ArtMethod* referrer,
	InvokeType type) {
	mirror::ArtMethod* resolved_method = referrer->GetDexCacheResolvedMethod(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);
	// 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 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);
	// 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;
	}

	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_.IsNull());
	mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read();
	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 dex_caches_[idx].Read();
	}

	} // namespace art

	#endif // ART_RUNTIME_CLASS_LINKER_INL_H_