Jason Zaugg retronym

indylambda: Putting invokedynamic to work for Scala

Java 8 introduced lambdas to the Java language. While the design choices differ in many regards from Scala's functions, the underlying mechanics used to represent Java lambdas is flexible enough to be used as a target for the Scala compiler.

Lambdas in Java

Java does not have canonical heirarchy of generic function types (ala scala.FunctionN), but instead allows a lambda to be used as a shorthand for an anonymous implementation of an Functional Interface

Here's an example of creating a predicate that closes over one value:

Tuning Scala[c]

Using every tool in the box to squeeze out some more compiler performance.

Tooling

Java Flight Recorder

JMC / JFR resources:

http://docs.oracle.com/javacomponents/jmc-5-5/jfr-runtime-guide/about.htm

Process

Scala PR review checklist
Scala SIP Template / review checklist

Ideas

Finalize classes/methods in stdlib
Unused code detection / eradication
optimize local lazy vals that don't escape

	# You will need Mercurial; get it with `brew install hg`.

	hg clone http://hg.openjdk.java.net/jdk8u/jdk8u
	cd jdk8u
	hg update jdk8u92-b14
	chmod +x ./get_source.sh; ./get_source.sh
	cd hotspot/src/share/tools/hsdis
	wget http://ftp.heanet.ie/mirrors/gnu/binutils/binutils-2.26.tar.gz
	tar -xzf binutils-2.26.tar.gz
	make BINUTILS=binutils-2.26 ARCH=amd64

	// [info] Running p.Run
	// List(Fish(Bob, Esq.,12), Kitty(Thor, Esq.,java.awt.Color[r=255,g=200,b=0]))

	package misc

	import java.awt.Color

	trait Pet[A] {
	def name(a: A): String
	def renamed(a: A, newName: String): A

	package sbtcomplete

	import sbt._
	import complete.JLineCompletion
	import Keys._

	object SbtComplete {

	private val CompletionsCommand = "completions"
	private val CompletionsBrief = ("<arg>", "The string to complete.")