Koremods/wtf.gofancy.koremods.dsl/InsnTarget

InsnTarget

Used for manipulating bytecode around a target sequence of bytecode instructions in an InsnList. Because ASM's instruction classes don't implement equals, a custom method is used for matching instructions, which currently supports most of them. See insnEquals for a full list.

Provides a shared label registry through TargetedAssembly for sharing labels across insertions within the same target.

Use InsnList.findTarget or one of its overloaded functions to create an appropriate implementation of this interface.

Example usage:

val method = MethodNode().koffee {
    ldc("Hello World")
    astore_0
    ldc("Foo Bar")
    astore_1

    getstatic("java/lang/System", "out", "java/io/PrintStream")
    // Load "Hello World"
    aload_0
    invokevirtual("java/io/PrintStream", "println", "(Ljava/lang/String;)V")
}
// Locate the sequence of printing instructions
val target = method.findTarget {
    getstatic("java/lang/System", "out", "java/io/PrintStream")
    aload_0 // <- Offset 1
    invokevirtual("java/io/PrintStream", "println", "(Ljava/lang/String;)V")
}
// Replace the loaded variable on the stack
target.insert(1) {
    pop
    aload_1
}