Open-source multiplayer game server compatible with the RuneScape client
https://www.openrs2.org/
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89 lines
2.9 KiB
89 lines
2.9 KiB
package dev.openrs2.deob.transform
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import com.github.michaelbull.logging.InlineLogger
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import dev.openrs2.asm.InsnMatcher
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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.transform.Transformer
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import org.objectweb.asm.Opcodes
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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.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 BitwiseOpTransformer : Transformer() {
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private val methodOps = mutableMapOf<MemberRef, Int>()
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private var inlinedOps = 0
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override fun preTransform(classPath: ClassPath) {
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methodOps.clear()
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inlinedOps = 0
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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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if (method.access and Opcodes.ACC_STATIC == 0) {
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continue
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}
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if (method.desc != BITWISE_OP_DESC) {
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continue
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}
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val match = BITWISE_OP_MATCHER.match(method).firstOrNull() ?: continue
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val iload0 = match[0] as VarInsnNode
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val iload1 = match[1] as VarInsnNode
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if (iload0.`var` != 0 || iload1.`var` != 1) {
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continue
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}
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val methodRef = MemberRef(clazz, method)
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methodOps[methodRef] = match[2].opcode
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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 { methodOps.containsKey(MemberRef(clazz, it)) }
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return false
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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 it = method.instructions.iterator()
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while (it.hasNext()) {
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val insn = it.next()
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if (insn !is MethodInsnNode || insn.opcode != Opcodes.INVOKESTATIC) {
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continue
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}
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val opcode = methodOps[MemberRef(insn)]
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if (opcode != null) {
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it.set(InsnNode(opcode))
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inlinedOps++
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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 { "Inlined $inlinedOps bitwise ops and removed ${methodOps.size} redundant methods" }
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}
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private companion object {
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private val logger = InlineLogger()
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private val BITWISE_OP_MATCHER = InsnMatcher.compile("^ILOAD ILOAD (IXOR | IAND | IOR) IRETURN$")
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private const val BITWISE_OP_DESC = "(II)I"
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}
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}
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