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/*
* Copyright 2016-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
*/
package kotlinx.coroutines.debug
import kotlinx.coroutines.debug.internal.DebugProbesImpl
import sun.misc.*
import java.lang.instrument.*
import java.lang.instrument.ClassFileTransformer
import java.security.*
import android.annotation.*
/*
* This class is loaded if and only if kotlinx-coroutines-core was used as -javaagent argument,
* but Android complains anyway (java.lang.instrument.*), so we suppress all lint checks here
*/
@Suppress("unused")
@SuppressLint("all")
internal object AgentPremain {
public var isInstalledStatically = false
private val enableCreationStackTraces = runCatching {
System.getProperty("kotlinx.coroutines.debug.enable.creation.stack.trace")?.toBoolean()
}.getOrNull() ?: DebugProbesImpl.enableCreationStackTraces
@JvmStatic
public fun premain(args: String?, instrumentation: Instrumentation) {
isInstalledStatically = true
instrumentation.addTransformer(DebugProbesTransformer)
DebugProbesImpl.enableCreationStackTraces = enableCreationStackTraces
DebugProbesImpl.install()
installSignalHandler()
}
internal object DebugProbesTransformer : ClassFileTransformer {
override fun transform(
loader: ClassLoader,
className: String,
classBeingRedefined: Class<*>?,
protectionDomain: ProtectionDomain,
classfileBuffer: ByteArray?
): ByteArray? {
if (className != "kotlin/coroutines/jvm/internal/DebugProbesKt") {
return null
}
/*
* DebugProbesKt.bin contains `kotlin.coroutines.jvm.internal.DebugProbesKt` class
* with method bodies that delegate all calls directly to their counterparts in
* kotlinx.coroutines.debug.DebugProbesImpl. This is done to avoid classfile patching
* on the fly (-> get rid of ASM dependency).
* You can verify its content either by using javap on it or looking at out integration test module.
*/
isInstalledStatically = true
return loader.getResourceAsStream("DebugProbesKt.bin").readBytes()
}
}
private fun installSignalHandler() {
try {
Signal.handle(Signal("TRAP")) { // kill -5
if (DebugProbesImpl.isInstalled) {
// Case with 'isInstalled' changed between this check-and-act is not considered
// a real debug probes use-case, thus is not guarded against.
DebugProbesImpl.dumpCoroutines(System.out)
} else {
println("Cannot perform coroutines dump, debug probes are disabled")
}
}
} catch (t: Throwable) {
// Do nothing, signal cannot be installed, e.g. because we are on Windows
}
}
}
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