Open-source multiplayer game server compatible with the RuneScape client
https://www.openrs2.org/
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64 lines
2.1 KiB
64 lines
2.1 KiB
package dev.openrs2.bundler.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.classpath.ClassPath
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import dev.openrs2.asm.classpath.Library
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import dev.openrs2.asm.replaceExpression
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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 MemoryAllocationTransformer : Transformer() {
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private var usedMemoryExprsZeroed = 0
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override fun preTransform(classPath: ClassPath) {
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usedMemoryExprsZeroed = 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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if ((method.access and Opcodes.ACC_STATIC) != 0) {
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return false
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}
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for (match in USED_MEMORY_MATCHER.match(method)) {
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val load1 = match[0] as VarInsnNode
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val load2 = match[2] as VarInsnNode
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if (load1.`var` != load2.`var`) {
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continue
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}
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val invoke1 = match[1] as MethodInsnNode
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if (invoke1.owner != "java/lang/Runtime" || invoke1.name != "totalMemory" || invoke1.desc != "()J") {
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continue
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}
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val invoke2 = match[3] as MethodInsnNode
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if (invoke2.owner != "java/lang/Runtime" || invoke2.name != "freeMemory" || invoke2.desc != "()J") {
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continue
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}
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if (method.instructions.replaceExpression(match[4], InsnNode(Opcodes.LCONST_0))) {
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usedMemoryExprsZeroed++
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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 { "Zeroed $usedMemoryExprsZeroed used memory expressions" }
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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 USED_MEMORY_MATCHER = InsnMatcher.compile("ALOAD INVOKEVIRTUAL ALOAD INVOKEVIRTUAL LSUB")
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}
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}
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