Add getSimpleExpression method

bzip2
Graham 5 years ago
parent 5d813a345d
commit e0d6390f87
  1. 30
      asm/src/main/java/dev/openrs2/asm/InsnListUtils.kt

@ -3,37 +3,39 @@ package dev.openrs2.asm
import org.objectweb.asm.tree.AbstractInsnNode
import org.objectweb.asm.tree.InsnList
fun InsnList.replaceSimpleExpression(last: AbstractInsnNode, replacement: AbstractInsnNode?): Boolean {
val deadInsns = mutableListOf<AbstractInsnNode>()
fun getSimpleExpression(last: AbstractInsnNode): List<AbstractInsnNode>? {
val expr = mutableListOf<AbstractInsnNode>()
var height = 0
var insn: AbstractInsnNode? = last
do {
val (pops, pushes) = insn!!.stackMetadata()
if (insn !== last) {
deadInsns.add(insn)
expr.add(insn)
height -= pushes
}
height += pops
if (height == 0) {
deadInsns.forEach(this::remove)
if (replacement != null) {
this[last] = replacement
} else {
remove(last)
}
return true
return expr.asReversed()
}
insn = insn.previous
} while (insn != null && insn.type != AbstractInsnNode.LABEL && insn.pure)
return false
return null
}
fun InsnList.replaceSimpleExpression(last: AbstractInsnNode, replacement: AbstractInsnNode): Boolean {
val expr = getSimpleExpression(last) ?: return false
expr.forEach(this::remove)
this[last] = replacement
return true
}
fun InsnList.deleteSimpleExpression(last: AbstractInsnNode): Boolean {
return replaceSimpleExpression(last, null)
val expr = getSimpleExpression(last) ?: return false
expr.forEach(this::remove)
remove(last)
return true
}

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