Unfortunately, this rule is undocumented for a very good reason: it is completely unsupported and supposed to be for testing-purposes only. This directive overrides the limitations of normal inlining to inline method bodies which might not otherwise be considered. While undocumented, this rule is supported by R8.Īnother undocumented, R8-specific rule can help guide inlinining is -alwaysinline. An example of this was shown in the value assumption post (and ProGuard has since come to add support for that rule!).
An object can be a class, a field, or a method. Thus a Reflection can be defined as a technique of inspecting and modifying the runtime behavior of an unknown object at run time. Zelix KlassMaster automatically handles such resolved Reflection API calls by updating the String literal that holds the class, field or method name to reflect. But aside from honoring what ProGuard supports, it does have a undocumented rules of its own. Java programming language provides a feature called Reflection that allows us to modify the runtime behavior of a class or field or method at runtime. R8 advertises its configuration rules as being compatible with those documented for ProGuard, the tool it’s meant to replace. The three method calls to getClass(), getSimpleName(), and the create() overload, along with specifying the arguments to those methods, exceeds the maximum allowed method body size for inline candidates. This example is no different in that regard, but it is different because the create(Activity) method is too large to be inlined normally. We are going to examine internal details such as an object's class name, modifiers, fields, methods, implemented interfaces, etc. Java class objects, as we mentioned earlier, give us access to the internal details of any object. The inlining of method bodies has been a staple in previous R8 posts as it often unlocks optimizations that otherwise would not apply. In this section, we will explore the most fundamental component in the Java reflection API. This operation is not terribly expensive, but it is still a form of reflection.Ĭlass MyActivity extends Activity When dealing with an instance, the Class reference is obtained by calling getClass() instead of a MyActivity.class literal. This works great in a static context where the MyActivity.class literal is fixed, but it does not work when used on an instance. This was presented in the context of log tags, where you might write that expression instead of the string literal so that the tag always reflects the actual class name, even after obfuscation. So let’s get back on track.Ĭlass constant operations allow R8 to take calls such as () and replace it with the string literal "MyActivity". In deep cloning, we have to copy fields one by one.
#Using java reflection to disable methods code
The below code snippet showcase the shallow cloning implementation.
It’s using reflection API to create the copy of the instance. This was actually a detour from what I had promised was next at the end of the class constant operations post which preceded it. The default implementation of Java Object clone () method is using shallow copy.
The previous post on R8 covered method outlining which automatically de-duplicated code. For an intro to R8 read “R8 Optimization: Staticization”. For an intro to D8 read “Android’s Java 8 support”.
#Using java reflection to disable methods series
Note: This post is part of a series on D8 and R8, Android’s new dexer and optimizer, respectively. Return JsonHelper.ToClass(jObj.R8 Optimization: Class Reflection and Forced Inlining Convert Json Object data into a specified class type private TModel Convert(JObject jObj) where TModel : IResourceKind : access denied ('' ''connect,resolve') There are numerous other use-cases in the standard library for example, reading system properties, reading environment variables, opening a file, reflection, and changing the locale, to name a few. Copy Code // only some types are lists for briefity private readonly Dictionary> mimeTypes