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58 lines
1.7 KiB
58 lines
1.7 KiB
package dev.openrs2.deob.transform
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import com.github.michaelbull.logging.InlineLogger
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import dev.openrs2.asm.classpath.ClassPath
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import dev.openrs2.asm.classpath.Library
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import dev.openrs2.asm.deleteExpression
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import dev.openrs2.asm.pure
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import dev.openrs2.asm.transform.Transformer
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import dev.openrs2.deob.analysis.LiveVariableAnalyzer
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import org.objectweb.asm.Opcodes
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import org.objectweb.asm.tree.AbstractInsnNode
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import org.objectweb.asm.tree.ClassNode
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import org.objectweb.asm.tree.MethodNode
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import org.objectweb.asm.tree.VarInsnNode
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class DummyLocalTransformer : Transformer() {
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private var localsRemoved = 0
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override fun preTransform(classPath: ClassPath) {
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localsRemoved = 0
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}
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override fun transformCode(classPath: ClassPath, library: Library, clazz: ClassNode, method: MethodNode): Boolean {
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val analyzer = LiveVariableAnalyzer(clazz.name, method)
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analyzer.analyze()
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val deadStores = mutableListOf<AbstractInsnNode>()
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for (insn in method.instructions) {
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if (insn !is VarInsnNode || insn.opcode != Opcodes.ISTORE) {
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continue
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}
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val live = analyzer.getInSet(insn)?.contains(insn.`var`) ?: false
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if (live) {
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continue
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}
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deadStores += insn
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}
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for (insn in deadStores) {
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if (method.instructions.deleteExpression(insn, AbstractInsnNode::pure)) {
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localsRemoved++
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}
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}
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return false
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}
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override fun postTransform(classPath: ClassPath) {
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logger.info { "Removed $localsRemoved dummy local variables" }
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}
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companion object {
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private val logger = InlineLogger()
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}
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}
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