Hi,
In case you've been looking for a low-level IR for Scala ASTs, now you can
inspect and transform a three-address-like IR (which are also valid Scala
ASTs) emitted by a compiler plugin to that effect.
Sample input:
object Test {
def main(args: Array[String]) {
val res =
if(b(1) + b(2) * b(3) > 0) { throw new Exception; "thenBranch" }
else { "elseBranch" }
}
def b(n: Int) = { scala.Console.println(n); n }
}
Sample output (excerpt):
def main(args: Array[java.lang.String]): Unit = {
var tmp10: java.lang.String = _;
val tmp1: Int = Test.this.b(1);
val tmp2: Int = tmp1;
val tmp3: Int = Test.this.b(2);
val tmp4: Int = tmp3;
val tmp5: Int = Test.this.b(3);
val tmp6: Int = tmp4.*(tmp5);
val tmp7: Int = tmp2.+(tmp6);
val tmp8: Int = tmp7;
val tmp9: Boolean = tmp8.>(0);
if (tmp9)
{
val tmp11: java.lang.Exception = new java.lang.Exception();
throw tmp11;
tmp10 = "thenBranch"
}
else
tmp10 = "elseBranch";
val res: java.lang.String = tmp10;
()
}
The PDF at
http://lamp.epfl.ch/~magarcia/ScalaCompilerCornerReloaded/2011Q2/Moving3A.pdf
is the technical documentation for the sources at
http://lampsvn.epfl.ch/trac/scala/browser/scala-experimental/trunk/imp/src
If you want to use this plugin *today*, please notice [1] (that came to
light during the development of this plugin). Alternatively, the plugin
sources show how to workaround that.
Comments and suggestions are welcome (at
http://groups.google.com/forum/#!forum/scala-internals).
Miguel
http://lamp.epfl.ch/~magarcia/ScalaCompilerCornerReloaded
[1] http://issues.scala-lang.org/browse/SI-4738
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