Open-source multiplayer game server compatible with the RuneScape client
https://www.openrs2.org/
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113 lines
3.7 KiB
113 lines
3.7 KiB
package dev.openrs2.deob.transform
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import com.github.michaelbull.logging.InlineLogger
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import dev.openrs2.asm.MemberRef
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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.hasCode
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import dev.openrs2.asm.nextReal
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import dev.openrs2.asm.removeDeadCode
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import dev.openrs2.asm.transform.Transformer
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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.InsnNode
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import org.objectweb.asm.tree.LdcInsnNode
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import org.objectweb.asm.tree.MethodInsnNode
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import org.objectweb.asm.tree.MethodNode
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import org.objectweb.asm.tree.VarInsnNode
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import javax.inject.Singleton
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@Singleton
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class ResetTransformer : Transformer() {
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private val resetMethods = mutableSetOf<MemberRef>()
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override fun preTransform(classPath: ClassPath) {
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resetMethods.clear()
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for (library in classPath.libraries) {
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for (clazz in library) {
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for (method in clazz.methods) {
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if (!method.hasCode) {
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continue
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}
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val masterReset = findMasterReset(method) ?: continue
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logger.info { "Identified master reset method $masterReset" }
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val resetClass = classPath.getClassNode("client")!!
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val resetMethod = resetClass.methods.first {
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it.name == masterReset.name && it.desc == masterReset.desc
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}
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findResetMethods(resetMethods, resetClass, resetMethod)
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resetMethod.instructions.clear()
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resetMethod.tryCatchBlocks.clear()
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resetMethod.instructions.add(InsnNode(Opcodes.RETURN))
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}
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}
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}
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}
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override fun transformClass(classPath: ClassPath, library: Library, clazz: ClassNode): Boolean {
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clazz.methods.removeIf { resetMethods.contains(MemberRef(clazz, it)) }
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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 ${resetMethods.size} reset methods" }
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}
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private companion object {
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private val logger = InlineLogger()
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private fun findMasterReset(method: MethodNode): MemberRef? {
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var shutdownLdc: AbstractInsnNode? = null
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for (insn in method.instructions) {
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if (insn is LdcInsnNode && insn.cst == "Shutdown complete - clean:") {
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shutdownLdc = insn
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break
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}
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}
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var insn = shutdownLdc
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while (insn != null) {
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if (insn !is VarInsnNode || insn.opcode != Opcodes.ALOAD) {
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insn = insn.previous
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continue
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}
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if (insn.`var` != 0) {
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insn = insn.previous
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continue
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}
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val nextInsn = insn.nextReal
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if (nextInsn !is MethodInsnNode || nextInsn.opcode != Opcodes.INVOKEVIRTUAL) {
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insn = insn.previous
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continue
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}
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if (nextInsn.desc != "()V") {
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insn = insn.previous
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continue
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}
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return MemberRef(nextInsn)
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}
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return null
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}
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private fun findResetMethods(resetMethods: MutableSet<MemberRef>, clazz: ClassNode, method: MethodNode) {
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method.removeDeadCode(clazz.name)
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for (insn in method.instructions) {
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if (insn is MethodInsnNode && insn.opcode == Opcodes.INVOKESTATIC) {
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resetMethods.add(MemberRef(insn))
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}
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}
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}
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}
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}
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