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bugfix: Fix compilation on newer JDK #785

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merged 1 commit into from
Aug 17, 2023
Merged

bugfix: Fix compilation on newer JDK #785

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1 change: 0 additions & 1 deletion mdoc/src/main/scala-2/mdoc/internal/markdown/MarkdownCompiler.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -27,7 +27,6 @@ import scala.tools.nsc.Settings
import scala.tools.nsc.io.AbstractFile
import scala.tools.nsc.io.VirtualDirectory
import scala.annotation.implicitNotFound
import mdoc.internal.CompatClassloader
import mdoc.internal.worksheets.Compat._

class MarkdownCompiler(
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45 changes: 34 additions & 11 deletions mdoc/src/main/scala/mdoc/internal/CompatClassloader.scala
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Expand Up @@ -2,11 +2,15 @@ package mdoc.internal

import java.net.URLClassLoader
import java.net.URL
import sun.misc.Unsafe
import mdoc.internal.pos.PositionSyntax._

object CompatClassloader {

abstract class Unsafe {
def objectFieldOffset(field: java.lang.reflect.Field): Long
def getObject(obj: AnyRef, offset: Long): AnyRef
}

/** Utility to get SystemClassLoader/ClassLoader urls in java8 and java9+ Based upon:
* https://gist.github.com/hengyunabc/644f8e84908b7b405c532a51d8e34ba9
*/
Expand All @@ -21,9 +25,10 @@ object CompatClassloader {
.startsWith("jdk.internal.loader.ClassLoaders$")
) {
try {
val field = classOf[Unsafe].getDeclaredField("theUnsafe")
val unsafeClass = classLoader.loadClass("sun.misc.Unsafe")
val field = unsafeClass.getDeclaredField("theUnsafe")
field.setAccessible(true)
val unsafe = field.get(null).asInstanceOf[Unsafe]
val unsafe = field.get(null)

// jdk.internal.loader.ClassLoaders.AppClassLoader.ucp
val ucpField = {
Expand All @@ -34,14 +39,32 @@ object CompatClassloader {
classLoader.getClass()
}
}.getDeclaredField("ucp")
val ucpFieldOffset: Long = unsafe.objectFieldOffset(ucpField)
val ucpObject = unsafe.getObject(classLoader, ucpFieldOffset)

// jdk.internal.loader.URLClassPath.path
val pathField = ucpField.getType().getDeclaredField("path")
val pathFieldOffset = unsafe.objectFieldOffset(pathField)
val paths: Seq[URL] = unsafe
.getObject(ucpObject, pathFieldOffset)

def objectFieldOffset(field: java.lang.reflect.Field): Long =
unsafeClass
.getMethod(
"objectFieldOffset",
classOf[java.lang.reflect.Field]
)
.invoke(unsafe, field)
.asInstanceOf[Long]

def getObject(obj: AnyRef, offset: Long): AnyRef =
unsafeClass
.getMethod(
"getObject",
classOf[AnyRef],
classOf[Long]
)
.invoke(unsafe, obj, offset.asInstanceOf[AnyRef])
.asInstanceOf[AnyRef]

val ucpFieldOffset = objectFieldOffset(ucpField)
val ucpObject = getObject(classLoader, ucpFieldOffset)

val pathField = ucpField.getType().getDeclaredField("path")
val pathFieldOffset = objectFieldOffset(pathField)
val paths: Seq[URL] = getObject(ucpObject, pathFieldOffset)
.asInstanceOf[java.util.ArrayList[URL]]
.asScala
.toSeq
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