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Optimize attaching the debug probes #4619

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Optimize attaching the debug probes #4619

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57c7902
Optimize attaching the debug probes
dkhalanskyjb Feb 17, 2026
fb09810
Move the top-level cache variables into the companion object
dkhalanskyjb Jul 10, 2026
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41 changes: 26 additions & 15 deletions kotlinx-coroutines-debug/src/Attach.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -16,23 +16,34 @@ internal class ByteBuddyDynamicAttach : Function1<Boolean, Unit> {

private fun attach() {
ByteBuddyAgent.install(ByteBuddyAgent.AttachmentProvider.ForEmulatedAttachment.INSTANCE)
val cl = Class.forName("kotlin.coroutines.jvm.internal.DebugProbesKt")
val cl2 = Class.forName("kotlinx.coroutines.debug.internal.DebugProbesKt")

ByteBuddy()
.redefine(cl2)
.name(cl.name)
.make()
.load(cl.classLoader, ClassReloadingStrategy.fromInstalledAgent())
dynamicTypeWithProbes.load(targetClassLoader, ClassReloadingStrategy.fromInstalledAgent())
}

private fun detach() {
val cl = Class.forName("kotlin.coroutines.jvm.internal.DebugProbesKt")
val cl2 = Class.forName("kotlinx.coroutines.debug.NoOpProbesKt")
ByteBuddy()
.redefine(cl2)
.name(cl.name)
.make()
.load(cl.classLoader, ClassReloadingStrategy.fromInstalledAgent())
dynamicTypeWithoutProbes.load(targetClassLoader, ClassReloadingStrategy.fromInstalledAgent())
}

private companion object {
private const val classNameToOverride = "kotlin.coroutines.jvm.internal.DebugProbesKt"

private val targetClassLoader by lazy {
Class.forName(classNameToOverride).classLoader
}

private val dynamicTypeWithProbes by lazy {
val classWithProbes = Class.forName("kotlinx.coroutines.debug.internal.DebugProbesKt")
ByteBuddy()
.redefine(classWithProbes)
.name(classNameToOverride)
.make()
}

private val dynamicTypeWithoutProbes by lazy {
val classWithoutProbes = Class.forName("kotlinx.coroutines.debug.NoOpProbesKt")
ByteBuddy()
.redefine(classWithoutProbes)
.name(classNameToOverride)
.make()
}
}
}