/*
|
* Copyright (C) 2008 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 "java_lang_VMClassLoader.h"
|
|
#include "base/zip_archive.h"
|
#include "class_linker.h"
|
#include "dex/descriptors_names.h"
|
#include "dex/dex_file_loader.h"
|
#include "dex/utf.h"
|
#include "handle_scope-inl.h"
|
#include "jni/jni_internal.h"
|
#include "mirror/class_loader.h"
|
#include "mirror/object-inl.h"
|
#include "native_util.h"
|
#include "nativehelper/jni_macros.h"
|
#include "nativehelper/scoped_local_ref.h"
|
#include "nativehelper/scoped_utf_chars.h"
|
#include "obj_ptr.h"
|
#include "scoped_fast_native_object_access-inl.h"
|
#include "well_known_classes.h"
|
|
namespace art {
|
|
// A class so we can be friends with ClassLinker and access internal methods.
|
class VMClassLoader {
|
public:
|
static ObjPtr<mirror::Class> LookupClass(ClassLinker* cl,
|
Thread* self,
|
const char* descriptor,
|
size_t hash,
|
ObjPtr<mirror::ClassLoader> class_loader)
|
REQUIRES(!Locks::classlinker_classes_lock_)
|
REQUIRES_SHARED(Locks::mutator_lock_) {
|
return cl->LookupClass(self, descriptor, hash, class_loader);
|
}
|
|
static ObjPtr<mirror::Class> FindClassInPathClassLoader(ClassLinker* cl,
|
ScopedObjectAccessAlreadyRunnable& soa,
|
Thread* self,
|
const char* descriptor,
|
size_t hash,
|
Handle<mirror::ClassLoader> class_loader)
|
REQUIRES_SHARED(Locks::mutator_lock_) {
|
ObjPtr<mirror::Class> result;
|
if (cl->FindClassInBaseDexClassLoader(soa, self, descriptor, hash, class_loader, &result)) {
|
DCHECK(!self->IsExceptionPending());
|
return result;
|
}
|
if (self->IsExceptionPending()) {
|
self->ClearException();
|
}
|
return nullptr;
|
}
|
};
|
|
static jclass VMClassLoader_findLoadedClass(JNIEnv* env, jclass, jobject javaLoader,
|
jstring javaName) {
|
ScopedFastNativeObjectAccess soa(env);
|
ObjPtr<mirror::ClassLoader> loader = soa.Decode<mirror::ClassLoader>(javaLoader);
|
ScopedUtfChars name(env, javaName);
|
if (name.c_str() == nullptr) {
|
return nullptr;
|
}
|
ClassLinker* cl = Runtime::Current()->GetClassLinker();
|
|
// Compute hash once.
|
std::string descriptor(DotToDescriptor(name.c_str()));
|
const size_t descriptor_hash = ComputeModifiedUtf8Hash(descriptor.c_str());
|
|
ObjPtr<mirror::Class> c = VMClassLoader::LookupClass(cl,
|
soa.Self(),
|
descriptor.c_str(),
|
descriptor_hash,
|
loader);
|
if (c != nullptr && c->IsResolved()) {
|
return soa.AddLocalReference<jclass>(c);
|
}
|
// If class is erroneous, throw the earlier failure, wrapped in certain cases. See b/28787733.
|
if (c != nullptr && c->IsErroneous()) {
|
cl->ThrowEarlierClassFailure(c);
|
Thread* self = soa.Self();
|
ObjPtr<mirror::Class> iae_class =
|
self->DecodeJObject(WellKnownClasses::java_lang_IllegalAccessError)->AsClass();
|
ObjPtr<mirror::Class> ncdfe_class =
|
self->DecodeJObject(WellKnownClasses::java_lang_NoClassDefFoundError)->AsClass();
|
ObjPtr<mirror::Class> exception = self->GetException()->GetClass();
|
if (exception == iae_class || exception == ncdfe_class) {
|
self->ThrowNewWrappedException("Ljava/lang/ClassNotFoundException;",
|
c->PrettyDescriptor().c_str());
|
}
|
return nullptr;
|
}
|
|
// Hard-coded performance optimization: We know that all failed libcore calls to findLoadedClass
|
// are followed by a call to the the classloader to actually
|
// load the class.
|
if (loader != nullptr) {
|
// Try the common case.
|
StackHandleScope<1> hs(soa.Self());
|
c = VMClassLoader::FindClassInPathClassLoader(cl,
|
soa,
|
soa.Self(),
|
descriptor.c_str(),
|
descriptor_hash,
|
hs.NewHandle(loader));
|
if (c != nullptr) {
|
return soa.AddLocalReference<jclass>(c);
|
}
|
}
|
|
// The class wasn't loaded, yet, and our fast-path did not apply (e.g., we didn't understand the
|
// classloader chain).
|
return nullptr;
|
}
|
|
/*
|
* Returns an array of entries from the boot classpath that could contain resources.
|
*/
|
static jobjectArray VMClassLoader_getBootClassPathEntries(JNIEnv* env, jclass) {
|
const std::vector<const DexFile*>& path =
|
Runtime::Current()->GetClassLinker()->GetBootClassPath();
|
jobjectArray array =
|
env->NewObjectArray(path.size(), WellKnownClasses::java_lang_String, nullptr);
|
if (array == nullptr) {
|
DCHECK(env->ExceptionCheck());
|
return nullptr;
|
}
|
for (size_t i = 0; i < path.size(); ++i) {
|
const DexFile* dex_file = path[i];
|
|
// For multidex locations, e.g., x.jar!classes2.dex, we want to look into x.jar.
|
const std::string location(DexFileLoader::GetBaseLocation(dex_file->GetLocation()));
|
|
ScopedLocalRef<jstring> javaPath(env, env->NewStringUTF(location.c_str()));
|
if (javaPath.get() == nullptr) {
|
DCHECK(env->ExceptionCheck());
|
return nullptr;
|
}
|
env->SetObjectArrayElement(array, i, javaPath.get());
|
}
|
return array;
|
}
|
|
static JNINativeMethod gMethods[] = {
|
FAST_NATIVE_METHOD(VMClassLoader, findLoadedClass, "(Ljava/lang/ClassLoader;Ljava/lang/String;)Ljava/lang/Class;"),
|
NATIVE_METHOD(VMClassLoader, getBootClassPathEntries, "()[Ljava/lang/String;"),
|
};
|
|
void register_java_lang_VMClassLoader(JNIEnv* env) {
|
REGISTER_NATIVE_METHODS("java/lang/VMClassLoader");
|
}
|
|
} // namespace art
|
