Add live variable analysis

bzip2
Graham 5 years ago
parent f0eabb0619
commit 400a10f8d2
  1. 30
      deob/src/main/java/dev/openrs2/deob/analysis/LiveVariableAnalyzer.kt

@ -0,0 +1,30 @@
package dev.openrs2.deob.analysis
import org.objectweb.asm.Opcodes
import org.objectweb.asm.tree.AbstractInsnNode
import org.objectweb.asm.tree.IincInsnNode
import org.objectweb.asm.tree.MethodNode
import org.objectweb.asm.tree.VarInsnNode
class LiveVariableAnalyzer(owner: String, method: MethodNode) :
DataFlowAnalyzer<Set<Int>>(owner, method, backwards = true) {
override fun createInitialSet(): Set<Int> {
return emptySet()
}
override fun join(set1: Set<Int>, set2: Set<Int>): Set<Int> {
return set1 union set2
}
override fun transfer(set: Set<Int>, insn: AbstractInsnNode): Set<Int> {
return when (insn) {
is VarInsnNode -> when (insn.opcode) {
Opcodes.ILOAD, Opcodes.LLOAD, Opcodes.FLOAD, Opcodes.DLOAD, Opcodes.ALOAD -> set.plus(insn.`var`)
Opcodes.ISTORE, Opcodes.LSTORE, Opcodes.FSTORE, Opcodes.DSTORE, Opcodes.ASTORE -> set.minus(insn.`var`)
else -> set
}
is IincInsnNode -> set.plus(insn.`var`)
else -> set
}
}
}
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