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# The Lillero Book
This is meant as an in-depth guide to ASM manipulation with the [Lillero](https://github.com/zaaarf/lillero) framework. While that's the main focus, it's written to also be useful to anyone wanting to learn ASM patching in general. Some parts (which will be flagged appropriately) may be applicable to Minecraft alone, but most of the book is meant to be generic.
The [ASM](https://asm.ow2.io/) library that Lillero is built with is capable of so much more than what is described in this book. In fact, the [official ASM guide](https://asm.ow2.io/asm4-guide.pdf) is a must-read for anyone wishing to understand its inner workings more in depth. While very well written, the ASM guide reads more like a scientific paper than a user manual, and this is part of my reasons for creating the Lillero Book. Much like Lillero is an intermediary layer meant to simplify working with ASM, this book is an intermediary step meant to give you a passable understanding of patching before plunging deep into the obscure inner workings of Java bytecode.
In short, this is no replacement for the ASM manual: think of the Lillero Book as a (relatively) simple introduction to its topics.

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<ol class="chapter"><li class="chapter-item expanded affix "><a href="../index.html" class="active">Foreword</a></li><li class="chapter-item expanded affix "><a href="what_is_lillero.html">What is Lillero?</a></li><li class="chapter-item expanded "><a href="1_introduction/asm_patching.html"><strong aria-hidden="true">1.</strong> An introduction to ASM Patching</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="1_introduction/why_mixin.html"><strong aria-hidden="true">1.1.</strong> Why (not) Mixin?</a></li><li class="chapter-item expanded "><a href="1_introduction/why_lillero.html"><strong aria-hidden="true">1.2.</strong> Why Lillero?</a></li></ol></li></ol>
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<h1 id="the-lillero-book"><a class="header" href="#the-lillero-book">The Lillero Book</a></h1>
<p>This is meant as an in-depth guide to ASM manipulation with the <a href="https://github.com/zaaarf/lillero">Lillero</a> framework. While that's the main focus, it's written to also be useful to anyone wanting to learn ASM patching in general. Some parts (which will be flagged appropriately) may be applicable to Minecraft alone, but most of the book is meant to be generic.</p>
<p>The <a href="https://asm.ow2.io/">ASM</a> library that Lillero is built with is capable of so much more than what is described in this book. In fact, the <a href="https://asm.ow2.io/asm4-guide.pdf">official ASM guide</a> is a must-read for anyone wishing to understand its inner workings more in depth. In fact, this is no replacement for that guide: think of the Lillero Book as a (relatively) simple introduction to the topics covered by the ASM guide in detail.</p>
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# Summary
[Foreword](../README.md)
[What is Lillero?](./what_is_lillero.md)
- [An introduction to ASM Patching](./1_introduction/asm_patching.md)
- [Why (not) Mixin?](./1_introduction/why_mixin.md)