Homework 4 - Generating Lower-Level Intermediate Code

The next step of your project will translate the Piglet intermediate representation to an even lower-level IR, which we'll call Spiglet. Spiglet is a proper subset of Piglet. The Spiglet grammar (JavaCC version) has two differences from that of Piglet:

    A StmtExp is not an Exp in Spiglet.
    In many places, a SimpleExp or Temp is used instead of an Exp.

Practically this means that many expressions need to be broken down into simpler ones. The usual example programs in Spiglet are here (corresponding to the MiniJava examples). Since Spiglet is a subset of Piglet, you can use the same formatter and interpreter as in the previous homework. If you want to ensure that a Spiglet program is legal Spiglet (and not just Piglet) you can use this parser by typing "java -jar spp.jar < [Input-program]". If the program is syntactically legal Spiglet, you will receive the message "Program parsed successfully".

Your program should run as follows:

java [MainClassName] [file1.pg] [file2.pg] ... [fileN.pg]

That is, your program must compile to Spiglet all .pg files given as arguments. Moreover, the outputs must be stored in files named file1.spg, file2.spg, ... fileN.spg respectively.