A prototype meta DSL that generates Delite DSL implementations from a specification-like program.
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A prototype meta DSL that generates Delite DSL implementations from a specification-like program.


A Forge DSL consists of a Forge specification (see src/examples) and optional applications (apps) and external code (extern). Forge generates DSL implementations from the specification, which are combined with the apps and external components to produce a complete DSL with examples. The publish script (bin/publish) automates this process for apps and external components located in apps/{dslName} and extern/{dslName}, by convention.

Alternatively, a user can simply copy the results of the Forge generation to another location to combine it with existing components.


Forge currently works with and requires Lightweight Modular Staging (https://github.com/TiarkRompf/virtualization-lms-core) branch delite-develop and Delite (https://github.com/stanford-ppl/Delite) branch develop.

  1. Download and build both of these repositories on the corresponding branch. Make sure that you run sbt publish-local on each of them (in Delite, only the runtime and framework projects need to be published). Set the DELITE_HOME environment variable to the root of the Delite repository and the FORGE_HOME environment variable to the root of the Forge repository.

  2. Compile Forge using sbt compile from the root of the Forge repository. The SimpleVectorDSL example can then be run using:

     bin/update ppl.dsl.forge.examples.SimpleVectorDSLRunner SimpleVector
     cd published/simplevector/
  3. Run the sample application (apps/simplevector/src/HelloWorld.scala)

    Interpreter (library mode):

     bin/delitec HelloSimpleInterpreter

    Compiler (Delite mode):

     bin/delitec HelloSimpleCompiler
     bin/delite HelloSimpleCompiler

Using an existing Forge DSL

To use a Forge DSL that comes packaged with the Forge repository (e.g. OptiML, OptiQL), you can generate the DSL and then cd into the published folder (or move it to another location) and use it as normal, or you can put your applications in the <FORGE_HOME>/apps/<DSL>/src/ folder, which is automatically copied to the generated DSL directory during publishing.

To generate a DSL and move it to an external location (e.g. OptiML):

    bin/update ppl.dsl.forge.dsls.optiml.OptiMLDSLRunner OptiML
    mv published/OptiML <destination>

The destination will now contain the generated DSL, and you can add applications directly in the apps folder, and compile and run them using

    sbt compile
    bin/delitec <fully.qualified.appObject>
    bin/delite <fully.qualified.appObject>

You can also enter interactive mode using

    sbt "; console"

To run a DSL application located in <FORGE_HOME>/apps/<DSL>/src/, (e.g. Logistic Regression):

  • Interpreter:

      bin/update -r "LogRegInterpreter <args>" ppl.dsl.forge.dsls.optiml.OptiMLDSLRunner OptiML
  • Compiler:

      bin/update -d -r "LogRegCompiler <args>" ppl.dsl.forge.dsls.optiml.OptiMLDSLRunner OptiML
  • Interactive:

      bin/update -i ppl.dsl.forge.dsls.optiml.OptiMLDSLRunner OptiML

If the DSL has already been generated, you can supply the -s 3 parameter to update to skip immediately to the publishing step.