Create a class loader context starting from an existing ClassLoader
Extend ClassLoaderContext to be able to generate a context from an
existing class loader.
This will be used in extending the duplicate class check to cover
DelegateLastClassLoaders.
Most of the functionality is migrated from OatFileManager with some
cleanups consisting of extra docs and more conservative checks on the
integrity of the class loader chain.
Test: m test-art-host
Bug: 38138251
Change-Id: If7c18cb75bfc9e6784676f96a666bf13b04c8b8b
diff --git a/runtime/class_loader_utils.h b/runtime/class_loader_utils.h
new file mode 100644
index 0000000..d160a51
--- /dev/null
+++ b/runtime/class_loader_utils.h
@@ -0,0 +1,50 @@
+/*
+ * 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 "handle_scope.h"
+#include "mirror/class_loader.h"
+#include "scoped_thread_state_change-inl.h"
+#include "well_known_classes.h"
+
+namespace art {
+
+// Returns true if the given class loader is either a PathClassLoader or a DexClassLoader.
+// (they both have the same behaviour with respect to class lockup order)
+static bool IsPathOrDexClassLoader(ScopedObjectAccessAlreadyRunnable& soa,
+ Handle<mirror::ClassLoader> class_loader)
+ REQUIRES_SHARED(Locks::mutator_lock_) {
+ 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));
+}
+
+static bool IsDelegateLastClassLoader(ScopedObjectAccessAlreadyRunnable& soa,
+ Handle<mirror::ClassLoader> class_loader)
+ REQUIRES_SHARED(Locks::mutator_lock_) {
+ mirror::Class* class_loader_class = class_loader->GetClass();
+ return class_loader_class ==
+ soa.Decode<mirror::Class>(WellKnownClasses::dalvik_system_DelegateLastClassLoader);
+}
+
+} // namespace art
+
+#endif // ART_RUNTIME_CLASS_LOADER_UTILS_H_