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In other words, ASM can also be defined as a framework that permits the manipulation and generation of JVM bytecode. It is an open-source library where JVM bytecode can be read, written, and manipulated. ASM is currently Java-centric and does not have a backend that allows implementations of other bytecode like Python bytecode, .NET bytecode, etc. It is not an acronym but a reference to the C keyword of asm which is useful for implementations of some functions in assembly language. Here, you can Find and Hire a skilled ASM Developer Freelancers from all over the world on Paperub.com

This framework is used for modifying existing classes or generating classes dynamically, directly in the format of their bytecode (binary). Apart from that, it also offers some common transformations of bytecode and algorithms for analysis from which tools for code analysis and custom complicated transformations are built. It also provides similar functionality to other frameworks of Java bytecode but it majorly focuses on performance. Since this framework is designed and implemented to be as fast and as small as possible, it is extremely suitable for use n dynamic systems but it can be utilized statically as well such as in compilers.

ASM framework is used in several projects. Let us have a brief discussion about it:

• It is used in OpenJDK, for generating the call sites of lambda as well as the Nashorn compiler.
• Jacoco and Cobertura, to the classes of instrument for measuring the code coverage.
• The Kotlin compiler and Groovy compiler
• It is also utilized in Byte Buddy for dynamically generating classes and other projects like Mockito (for generating mock classes).
• Gradle, for the generation of a few classes at runtime.

 Uses of ASM

ASM offers a simple library that reveals the components of the internal aggregate of a provided Java class via its visitor-oriented API. Along with this visitor API, this framework also provides a tree API that helps in representing classes as object builds. Both the APIs can be utilized to modify the bytecode of binary, along with the creation of new bytecode (Through injecting new code into the current/existing code or through the creation of new classes completely.) If you want to hire professional freelancers , you can Find and Hire a skilled ASM Developer on Paperub. This library is used for various diverse applications as follows:

Performance and Profiling: As per instrumentation, the performance metrics can be captured and injected into binaries of Java class for examining coverage/memory data. For instance, the Injection of instrumentation at the exit as well as entry points.

Implementation of Semantics related to New Language: For instance, Groovy utilizes ASM for generating its bytecode. Moreover, aspect-oriented inclusions to the language of Java have been executed with the use of this library for de-compassing class structures for point-cut verification and injecting aspect-related code into the binary while reconstituting the class.

What are the Two Sets of APIs Provided by ASM?

ASM Provides two sets of APIs that are discussed briefly:

Tree-based API: It helps in the construction of a structure that looks like a tree of the classes it looks in on. The root of the tree is the ‘ClassNode’ which contains methods, inner classes, fields, and other important information such as children. However, it is much slower than the event-based API. Following are some of the advantages of this set of APIs:

It entirely controls the classes that get visited by it.

As the full class is available as a tree, it becomes much easier to manipulate, convert and rewrite the parts of the tree (if required).

Event-based API: This set of APIs is fundamentally based on the pattern of the visitor and also offers two basic visitors. The two basic visitors are Class Writer and Class Visitor respectively. Class Writer is used to generating new classes whereas Class Visitor is to visit, analyze and convert a current or an existing class. The most important benefit of this API is that it is much faster than the Tree-based API.

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