Open-source multiplayer game server compatible with the RuneScape client
https://www.openrs2.org/
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100 lines
3.1 KiB
100 lines
3.1 KiB
package org.openrs2.deob.bytecode.transform
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import com.github.michaelbull.logging.InlineLogger
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import jakarta.inject.Inject
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import jakarta.inject.Singleton
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import org.objectweb.asm.Type
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import org.objectweb.asm.tree.ClassNode
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import org.objectweb.asm.tree.LabelNode
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import org.objectweb.asm.tree.MethodNode
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import org.openrs2.asm.MemberRef
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import org.openrs2.asm.classpath.ClassPath
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import org.openrs2.asm.classpath.Library
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import org.openrs2.asm.removeDeadCode
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import org.openrs2.asm.transform.Transformer
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import org.openrs2.deob.annotation.OriginalMember
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import org.openrs2.deob.bytecode.OriginalPcTable
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import org.openrs2.deob.util.map.NameMap
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@Singleton
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public class OriginalPcRestoreTransformer @Inject constructor(private val nameMap: NameMap) : Transformer() {
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private var originalPcsRestored = 0
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override fun preTransform(classPath: ClassPath) {
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originalPcsRestored = 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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method.removeDeadCode(clazz.name)
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val pcs = mutableMapOf<LabelNode, Int>()
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for (insn in method.instructions) {
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if (insn.opcode == -1) {
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continue
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}
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val originalPc = classPath.originalPcs[insn] ?: continue
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val label = LabelNode()
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method.instructions.insertBefore(insn, label)
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pcs[label] = originalPc
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originalPcsRestored++
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}
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val originalMember = method.getOriginalMember()
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val names: Map<Int, String> = if (originalMember != null) {
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nameMap.methods[originalMember]?.locals ?: emptyMap()
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} else {
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emptyMap()
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}
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if (method.attrs == null) {
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method.attrs = mutableListOf()
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}
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method.attrs.add(OriginalPcTable(pcs, names))
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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 { "Restored $originalPcsRestored original instruction indexes" }
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}
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private fun MethodNode.getOriginalMember(): MemberRef? {
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if (invisibleAnnotations == null) {
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return null
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}
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for (annotation in invisibleAnnotations) {
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if (annotation.desc != Type.getDescriptor(OriginalMember::class.java)) {
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continue
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}
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var owner: String? = null
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var name: String? = null
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var desc: String? = null
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for ((key, value) in annotation.values.windowed(2, 2)) {
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when (key) {
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"owner" -> owner = value as String
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"name" -> name = value as String
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"descriptor" -> desc = value as String
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}
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}
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check(owner != null) { "Failed to extract owner from OriginalMember" }
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check(name != null) { "Failed to extract name from OriginalMember" }
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check(desc != null) { "Failed to extract descriptor from OriginalMember" }
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return MemberRef(owner, name, desc)
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}
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return null
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}
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private companion object {
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private val logger = InlineLogger()
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}
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}
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