Next generation of macros

Implements SIP 16: Self-cleaning macros: http://bit.ly/wjjXTZ

Features:
* Macro defs
* Reification
* Type tags
* Manifests aliased to type tags
* Extended reflection API
* Several hundred tests
* 1111 changed files

Not yet implemented:
* Reification of refined types
* Expr.value splicing
* Named and default macro expansions
* Intricacies of interaction between macros and implicits
* Emission of debug information for macros (compliant with JSR-45)

Dedicated to Yuri Alekseyevich Gagarin

1 files changed, 53 insertions, 0 deletions

diff --git a/test/files/run/macro-range/Expansion_Impossible_2.scala b/test/files/run/macro-range/Expansion_Impossible_2.scala
new file mode 100644
index 0000000000..7a093b74ee
--- /dev/null
+++ b/test/files/run/macro-range/Expansion_Impossible_2.scala
@@ -0,0 +1,53 @@
+import reflect.api.Modifier
+import reflect.makro.Context
+
+object Impls {
+  def foreach(c: Context)(f: c.Expr[Int => Unit]): c.Expr[Unit] = {
+    // todo. read the compiler config and print if -Ydebug is set
+    //println("macro-expand, _this = "+ _this)
+    object utils extends Utils { val context: c.type = c }
+    import utils._
+    import c.mirror._
+
+    val initName = newTermName("<init>")
+    // Either:
+    //   scala"{ var i = $low; val h = $hi; while (i < h) { $f(i); i = i + 1 } }
+    // or:
+    //   scala"($_this: RangeDefault).foreach($f)"
+    c.prefix.tree match {
+      case Apply(Select(New(tpt), initName), List(lo, hi)) if tpt.symbol.fullName == "Range" =>
+        val iname = newTermName("$i")
+        val hname = newTermName("$h")
+        def iref = Ident(iname)
+        def href = Ident(hname)
+        val labelname = newTermName("$while")
+        val cond = makeBinop(iref, "$less", href)
+        val body = Block(
+            List(makeApply(f, List(iref))),
+            Assign(iref, makeBinop(iref, "$plus", Literal(Constant(1)))))
+        val generated =
+        Block(
+          List(
+            ValDef(Modifiers(Set(Modifier.mutable)), iname, TypeTree(), lo),
+            ValDef(Modifiers(), hname, TypeTree(), hi)),
+          makeWhile(labelname, cond, body))
+        // todo. read the compiler config and print if -Ydebug is set
+        //tools.nsc.util.trace("generated: ")(generated)
+        generated
+      case _ =>
+        Apply(
+          Select(
+            Typed(c.prefix, Ident(newTypeName("RangeDefault"))),
+            newTermName("foreach")),
+          List(f))
+    }
+  }
+}
+
+class Range(val from: Int, val to: Int) extends RangeDefault {
+  override def foreach(f: Int => Unit): Unit = macro Impls.foreach
+}
+
+object Test extends App {
+  new Range(1, 10) foreach println
+}
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