From c283ce145a7b34f18deeeac5c3de2b102169e074 Mon Sep 17 00:00:00 2001
From: Lukas Rytz <lukas.rytz@gmail.com>
Date: Tue, 3 Feb 2015 23:00:51 +0100
Subject: Test java reflection on scala library / reflect / compiler jars

Run a number of Java reflection operations on all classes in
scala library / reflect / compiler.

The test is based on a draft by Jason.
---
 .../jvm/innerClassEnclMethodJavaReflection.scala   | 65 ++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 test/files/jvm/innerClassEnclMethodJavaReflection.scala

(limited to 'test/files/jvm/innerClassEnclMethodJavaReflection.scala')

diff --git a/test/files/jvm/innerClassEnclMethodJavaReflection.scala b/test/files/jvm/innerClassEnclMethodJavaReflection.scala
new file mode 100644
index 0000000000..ee39cb43bf
--- /dev/null
+++ b/test/files/jvm/innerClassEnclMethodJavaReflection.scala
@@ -0,0 +1,65 @@
+import scala.reflect.io._
+import java.net.URLClassLoader
+
+object Test extends App {
+  val jarsOrDirectories = Set("partest.lib", "partest.reflect", "partest.comp") map sys.props
+
+  object AllowedMissingClass {
+    // Some classes in scala-compiler.jar have references to jline / ant classes, which seem to be
+    // not on the classpath. We just skip over those classes.
+    // PENDING: for now we also allow missing $anonfun classes: the optimizer may eliminate some closures
+    // that are refferred to in EnclosingClass attributes. SI-9136
+    val allowedMissingPackages = Set("jline", "org.apache.tools.ant", "$anonfun")
+
+    def ok(t: Throwable) = {
+      allowedMissingPackages.exists(p => t.getMessage.replace('/', '.').contains(p))
+    }
+
+    def unapply(t: Throwable): Option[Throwable] = t match {
+      case _: NoClassDefFoundError | _: ClassNotFoundException | _: TypeNotPresentException if ok(t) => Some(t)
+      case _ => None
+    }
+  }
+
+  jarsOrDirectories foreach testClasses
+
+  def testClasses(jarOrDirectory: String): Unit = {
+    val classPath = AbstractFile.getDirectory(new java.io.File(jarOrDirectory))
+
+    def flatten(f: AbstractFile): Iterator[AbstractFile] =
+      if (f.isClassContainer) f.iterator.flatMap(flatten)
+      else Iterator(f)
+
+    val classFullNames = flatten(classPath).filter(_.hasExtension("class")).map(_.path.replace("/", ".").replaceAll(".class$", ""))
+
+    // it seems that Class objects can only be GC'd together with their class loader
+    //   (http://stackoverflow.com/questions/2433261/when-and-how-are-classes-garbage-collected-in-java)
+    // if we just use the same class loader for the entire test (Class.forName), we run out of PermGen
+    // even with that, we still neeed a PermGen of 90M or so, the default 64 is not enough. I tried
+    // using one class loader per 100 classes, but that didn't help, the classes didn't get GC'd.
+    val classLoader = new URLClassLoader(Array(classPath.toURL))
+
+    val faulty = new collection.mutable.ListBuffer[(String, Throwable)]
+
+    def tryGetClass(name: String) = try {
+      Some[Class[_]](classLoader.loadClass(name))
+    } catch {
+      case AllowedMissingClass(_) => None
+    }
+
+    for (name <- classFullNames; cls <- tryGetClass(name)) {
+      try {
+        cls.getEnclosingMethod
+        cls.getEnclosingClass
+        cls.getEnclosingConstructor
+        cls.getDeclaredClasses
+      } catch {
+        case AllowedMissingClass(_) =>
+        case t: Throwable => faulty += ((name, t))
+      }
+    }
+
+    if (faulty.nonEmpty)
+      println(faulty.toList mkString "\n")
+  }
+}
-- 
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