SI-8779 Enable inlining of code within a REPL session

The REPL has a long running instance of Global which outputs
classfiles by default to a VirtualDirectory. The inliner did not find
any of these class files when compiling calls to methods defined in
previous runs (ie, previous lines of input.)

This commit:

  - Adds a hook to augment the classpath that the optimizer searches,
    and uses this in the REPL to add the output directory
  - Fixes the implementation of `findClassFile` in VirtualDirectory,
    which doesn't seem to have been used in anger before. I've factored out
    some common code into a new method on `AbstractFile`.
  - Fixes a similar problem getSubDir reported by Li Haoyi
  - Adds missing unit test coverage.

This also fixes a bug in REPL autocompletion for types defined
in packages >= 2 level deep (with the `:paste -raw` command).
I've added a test for this case.

1 files changed, 21 insertions, 0 deletions

diff --git a/test/files/run/repl-inline.scala b/test/files/run/repl-inline.scala
new file mode 100644
index 0000000000..5a5f205ad8
--- /dev/null
+++ b/test/files/run/repl-inline.scala
@@ -0,0 +1,21 @@
+import scala.tools.nsc._
+
+object Test {
+  val testCode = """
+def callerOfCaller = Thread.currentThread.getStackTrace.drop(2).head.getMethodName
+def g = callerOfCaller
+def h = g
+assert(h == "g", h)
+@inline def g = callerOfCaller
+def h = g
+assert(h == "h", h)
+  """
+
+  def main(args: Array[String]) {
+    val settings = new Settings()
+    settings.processArgumentString("-opt:l:classpath")
+    settings.usejavacp.value = true
+    val repl = new interpreter.IMain(settings)
+    testCode.linesIterator.foreach(repl.interpret(_))
+  }
+}