One of the projects under the Amber project umbrella is dynamic constants [1], which is currently developed at repo [2]. Most of the development is in the hotspot and libraries side. The main development on the compiler side so far has been the generation of an ldc of a condy instead of an indy call for the invocation of non-capturing lambdas. The goal of this task is to evaluate the difference, performance-wise, between both approaches.

This alternative generation, ldc + condy, is active by default in the condy project. In order to generate lambda invocations in the old way the following option should be passed to the compiler: -XDforNonCapturingLambda=generateIndy, to explicitly use the new approach whenever possible the option is: -XDforNonCapturingLambda=generateCondy

Below there is a code example for which and ldc of a condy should be generated instead of an indy:

import java.util.stream.*;

public class CondyForLambdaSmokeTest {
    void lookForThisMethod() {
        IntStream.of(1,2,3).reduce((a,b) -> a+b);
    }
}

[1] http://openjdk.java.net/jeps/309
[2] http://hg.openjdk.java.net/amber/amber branch: condy