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/*
* Copyright (C) 2017 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_LOADER_UTILS_H_
#define ART_RUNTIME_CLASS_LOADER_UTILS_H_
#include "art_field-inl.h"
#include "base/locks.h"
#include "handle_scope.h"
#include "jni/jni_internal.h"
#include "mirror/class_loader.h"
#include "mirror/object-inl.h"
#include "mirror/object.h"
#include "native/dalvik_system_DexFile.h"
#include "scoped_thread_state_change-inl.h"
#include "well_known_classes.h"
namespace art {
// Returns true if the given class loader derives from BaseDexClassLoader.
inline bool IsInstanceOfBaseDexClassLoader(ScopedObjectAccessAlreadyRunnable& soa,
Handle<mirror::ClassLoader> class_loader)
REQUIRES_SHARED(Locks::mutator_lock_) {
return class_loader->InstanceOf(
soa.Decode<mirror::Class>(WellKnownClasses::dalvik_system_BaseDexClassLoader));
}
// Returns true if the given class loader is either a PathClassLoader or a DexClassLoader.
// (they both have the same behaviour with respect to class lookup order)
inline bool IsPathOrDexClassLoader(ScopedObjectAccessAlreadyRunnable& soa,
Handle<mirror::ClassLoader> class_loader)
REQUIRES_SHARED(Locks::mutator_lock_) {
ObjPtr<mirror::Class> class_loader_class = class_loader->GetClass();
return
(class_loader_class ==
soa.Decode<mirror::Class>(WellKnownClasses::dalvik_system_PathClassLoader)) ||
(class_loader_class ==
soa.Decode<mirror::Class>(WellKnownClasses::dalvik_system_DexClassLoader));
}
// Returns true if the given class loader is an InMemoryDexClassLoader.
inline bool IsInMemoryDexClassLoader(ScopedObjectAccessAlreadyRunnable& soa,
Handle<mirror::ClassLoader> class_loader)
REQUIRES_SHARED(Locks::mutator_lock_) {
ObjPtr<mirror::Class> class_loader_class = class_loader->GetClass();
return (class_loader_class ==
soa.Decode<mirror::Class>(WellKnownClasses::dalvik_system_InMemoryDexClassLoader));
}
inline bool IsDelegateLastClassLoader(ScopedObjectAccessAlreadyRunnable& soa,
Handle<mirror::ClassLoader> class_loader)
REQUIRES_SHARED(Locks::mutator_lock_) {
ObjPtr<mirror::Class> class_loader_class = class_loader->GetClass();
return class_loader_class ==
soa.Decode<mirror::Class>(WellKnownClasses::dalvik_system_DelegateLastClassLoader);
}
// Visit the DexPathList$Element instances in the given classloader with the given visitor.
// Constraints on the visitor:
// * The visitor should return true to continue visiting more Elements.
// * The last argument of the visitor is an out argument of RetType. It will be returned
// when the visitor ends the visit (by returning false).
// This function assumes that the given classloader is a subclass of BaseDexClassLoader!
template <typename Visitor, typename RetType>
inline RetType VisitClassLoaderDexElements(ScopedObjectAccessAlreadyRunnable& soa,
Handle<mirror::ClassLoader> class_loader,
Visitor fn,
RetType defaultReturn)
REQUIRES_SHARED(Locks::mutator_lock_) {
Thread* self = soa.Self();
ObjPtr<mirror::Object> dex_path_list =
jni::DecodeArtField(WellKnownClasses::dalvik_system_BaseDexClassLoader_pathList)->
GetObject(class_loader.Get());
if (dex_path_list != nullptr) {
// DexPathList has an array dexElements of Elements[] which each contain a dex file.
ObjPtr<mirror::Object> dex_elements_obj =
jni::DecodeArtField(WellKnownClasses::dalvik_system_DexPathList_dexElements)->
GetObject(dex_path_list);
// Loop through each dalvik.system.DexPathList$Element's dalvik.system.DexFile and look
// at the mCookie which is a DexFile vector.
if (dex_elements_obj != nullptr) {
StackHandleScope<1> hs(self);
Handle<mirror::ObjectArray<mirror::Object>> dex_elements =
hs.NewHandle(dex_elements_obj->AsObjectArray<mirror::Object>());
for (auto element : dex_elements.Iterate<mirror::Object>()) {
if (element == nullptr) {
// Should never happen, fail.
break;
}
RetType ret_value;
if (!fn(element, &ret_value)) {
return ret_value;
}
}
}
}
return defaultReturn;
}
// Visit the DexFiles in the given classloader with the given visitor.
// Constraints on the visitor:
// * The visitor should return true to continue visiting more DexFiles.
// * The last argument of the visitor is an out argument of RetType. It will be returned
// when the visitor ends the visit (by returning false).
// This function assumes that the given classloader is a subclass of BaseDexClassLoader!
template <typename Visitor, typename RetType>
inline RetType VisitClassLoaderDexFiles(ScopedObjectAccessAlreadyRunnable& soa,
Handle<mirror::ClassLoader> class_loader,
Visitor fn,
RetType defaultReturn)
REQUIRES_SHARED(Locks::mutator_lock_) {
ArtField* const cookie_field =
jni::DecodeArtField(WellKnownClasses::dalvik_system_DexFile_cookie);
ArtField* const dex_file_field =
jni::DecodeArtField(WellKnownClasses::dalvik_system_DexPathList__Element_dexFile);
if (dex_file_field == nullptr || cookie_field == nullptr) {
return defaultReturn;
}
auto visit_dex_files = [&](ObjPtr<mirror::Object> element, RetType* ret)
REQUIRES_SHARED(Locks::mutator_lock_) {
ObjPtr<mirror::Object> dex_file = dex_file_field->GetObject(element);
if (dex_file != nullptr) {
ObjPtr<mirror::LongArray> long_array = cookie_field->GetObject(dex_file)->AsLongArray();
if (long_array == nullptr) {
// This should never happen so log a warning.
LOG(WARNING) << "Null DexFile::mCookie";
*ret = defaultReturn;
return true;
}
int32_t long_array_size = long_array->GetLength();
// First element is the oat file.
for (int32_t j = kDexFileIndexStart; j < long_array_size; ++j) {
const DexFile* cp_dex_file = reinterpret_cast<const DexFile*>(static_cast<uintptr_t>(
long_array->GetWithoutChecks(j)));
RetType ret_value;
if (!fn(cp_dex_file, /* out */ &ret_value)) {
*ret = ret_value;
return false;
}
}
}
return true;
};
return VisitClassLoaderDexElements(soa, class_loader, visit_dex_files, defaultReturn);
}
// Simplified version of the above, w/o out argument.
template <typename Visitor>
inline void VisitClassLoaderDexFiles(ScopedObjectAccessAlreadyRunnable& soa,
Handle<mirror::ClassLoader> class_loader,
Visitor fn)
REQUIRES_SHARED(Locks::mutator_lock_) {
auto helper = [&fn](const art::DexFile* dex_file, void** ret)
REQUIRES_SHARED(Locks::mutator_lock_) {
#ifdef __clang_analyzer__
*ret = nullptr;
#else
UNUSED(ret);
#endif
return fn(dex_file);
};
VisitClassLoaderDexFiles<decltype(helper), void*>(soa,
class_loader,
helper,
/* default= */ nullptr);
}
} // namespace art
#endif // ART_RUNTIME_CLASS_LOADER_UTILS_H_
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