A new totally safe signal manager, along with a...

A new totally safe signal manager, along with all the support code
needed for that. See the classes in scala.tools.reflect.* for
interesting new weapons. Also includes inaugural handy usage:

  scala> val x = 10
  x: Int = 10

  scala> while (true) ()
  [ctrl-C]
  Execution interrupted by signal.

  scala> x
  res1: Int = 10

No review, but feedback welcome.

1 files changed, 30 insertions, 0 deletions

diff --git a/src/compiler/scala/tools/reflect/package.scala b/src/compiler/scala/tools/reflect/package.scala
new file mode 100644
index 0000000000..cf3d6f9ab2
--- /dev/null
+++ b/src/compiler/scala/tools/reflect/package.scala
@@ -0,0 +1,30 @@
+/* NSC -- new Scala compiler
+ * Copyright 2005-2010 LAMP/EPFL
+ * @author Paul Phillips
+ */
+
+package scala.tools
+
+import java.lang.reflect.Method
+import java.{ lang => jl }
+
+package object reflect {
+  def nameAndArity(m: Method) = (m.getName, m.getParameterTypes.size)
+  def allInterfaces(cl: Class[_]): List[Class[_]] =
+    if (cl == null) Nil
+    else cl.getInterfaces.toList ++ allInterfaces(cl.getSuperclass) distinct
+
+  def zeroOfClass(clazz: Class[_]) = zeroOf(Manifest.classType(clazz))
+  def zeroOf[T](implicit m: Manifest[T]): AnyRef = {
+    if (m == manifest[Boolean] || m == manifest[jl.Boolean]) false: jl.Boolean
+    else if (m == manifest[Unit] || m == manifest[jl.Void]) scala.runtime.BoxedUnit.UNIT
+    else if (m == manifest[Char] || m == manifest[jl.Character]) 0.toChar: jl.Character
+    else if (m == manifest[Byte] || m == manifest[jl.Byte]) 0.toByte: jl.Byte
+    else if (m == manifest[Short] || m == manifest[jl.Short]) 0.toShort: jl.Short
+    else if (m == manifest[Int] || m == manifest[jl.Integer]) 0: jl.Integer
+    else if (m == manifest[Long] || m == manifest[jl.Long]) 0l: jl.Long
+    else if (m == manifest[Float] || m == manifest[jl.Float]) 0f: jl.Float
+    else if (m == manifest[Double] || m == manifest[jl.Double]) 0d: jl.Double
+    else null
+  }
+}