mirror of
https://github.com/zaaarf/lillero.git
synced 2024-11-14 11:39:22 +01:00
66 lines
3.5 KiB
Markdown
66 lines
3.5 KiB
Markdown
# Lillero
|
|
|
|
Lillero is a lightweight and simple Java ASM patching framework built on top of [ObjectWeb's ASM library](https://asm.ow2.io/).
|
|
|
|
## How
|
|
This library provides the core interface, `IInjector`, as well as a small set of utils to make your life easier. All patches should implement `IInjector` and be declared as [services](https://docs.oracle.com/javase/8/docs/api/java/util/ServiceLoader.html).
|
|
|
|
Some methods *must* be implemented, specifying which class and method will be patched:
|
|
* `targetClass()`: returns the *fully qualified name* of the class to patch (example: `net.minecraft.client.Minecraft`).
|
|
* `methodName()`: returns the name of the method to patch.
|
|
* `methodDesc()`: returns descriptor (arguments and return type) of method to patch.
|
|
* `inject(ClassNode, MethodNode)`: will be invoked providing you the ClassNode and MethodNode you requested. This is where the actual patching will happen.
|
|
|
|
There's some more optional methods you *don't have to* implement, but really should because they will make your life considerably easier when it's time to debug:
|
|
* `name()` : returns patch name
|
|
* `reason()` : returns patch description
|
|
|
|
Finally, you should mark your classes as service providers, by creating a text file called `ftbsc.lll.IInjector` in `src/main/resources/META-INF/services` on your project. Inside, put the fully qualified names of your patches (example: `ftbsc.bscv.asm.patches.TestPatch$TickPatch`).
|
|
|
|
If you use Gradle (you do) don't forget to add this library as a dependency in your `build.gradle`:
|
|
|
|
```groovy
|
|
repositories {
|
|
maven { url = 'https://maven.fantabos.co' }
|
|
}
|
|
dependencies {
|
|
implementation 'ftbsc:lll:<whatever the latest version is>'
|
|
}
|
|
```
|
|
|
|
You are going to need an appropriate loader to use Lillero patches: **this is just a library and does nothing by itself**. You need to make it work by loading services implementing the `IInjector` interface, and by calling their `inject(ClassNode, MethodNode)` methods with the appropriate parameters.
|
|
|
|
#### Tips specific to Minecraft patching
|
|
* Use Searge names in every place you are told to use a name.
|
|
- Use MCP (AKA unobfuscated) names if you are running from ForgeGradle's runClient task.
|
|
* Use our [loader](https://git.fantabos.co/lillero-loader/) that hooks into Forge's ModLauncher if you're writing a Forge mod.
|
|
* Spare yourself some trouble, and use this [annotation processor](https://git.fantabos.co/lillero-processor/) to reduce boilerplate.
|
|
* Make sure to dunk on all the naysayers who tried to force you to use Mixin!
|
|
|
|
#### Example Minecraft patch
|
|
The following is an example patch, located at `src/main/java/example/patches/SamplePatch.java`:
|
|
```java
|
|
package example.patches;
|
|
import ftbsc.lll.IInjector;
|
|
public class SamplePatch implements IInjector {
|
|
public String name() { return "SamplePatch"; }
|
|
public String targetClass() { return "net.minecraft.client.Minecraft"; }
|
|
public String methodName() { return "func_71407_l"; } // tick()
|
|
public String methodDesc() { return "()V"; }
|
|
public void inject(ClassNode clazz, MethodNode main) {
|
|
InsnList insnList = new InsnList();
|
|
insnList.add(new InsnNode(POP));
|
|
main.instructions.insert(insnList);
|
|
}
|
|
}
|
|
```
|
|
|
|
When loaded into Minecraft, this patch will crash the game with a NegativeArraySizeException as soon as it's done loading - so you know it's working.
|
|
|
|
The following is the service registration file, located at `src/main/resources/META-INF/services/ftbsc.lll.IInjector`:
|
|
```
|
|
example.patches.SamplePatch
|
|
```
|
|
|
|
Happy patching! And remember...
|
|
### "Don't do coremods!"
|