Package scale.backend.xyz

This package provides templates that can be used to create a code generator for a different architecture.

See:
Description

Class Summary

XyzAssembler	This class generates Xyz assembly language from a list of Xyz instructions.
XyzGenerator	This class converts Scribble into Xyz instructions.
XyzMachine	This is the base class for all Xyz specific information.
XyzRegisterSet	This class describes the register set of the Xyz architecture.

Package scale.backend.xyz Description

This package provides templates that can be used to create a code generator for a different architecture. The classes provided can be copied into the new directory for the new architecture and renamed. For example, assume you want to create a code generator for the HAL9000 system.

• Create a directory, called hal9000, in the scale/backend directory.
• Copy the five files from scale/backend/xyz to scale/backkend/hal9000.
• Rename the five files:

  XyzGenerator.java	⇒	Hal9000Generator.java
  XyzAssembler.java	⇒	Hal9000Assembler.java
  XyzRegisterSet.java	⇒	Hal9000RegisterSet.java
  XyzMachine.java	⇒	Hal9000Machine.java
  Makefile	⇒	Makefile

• Edit the files, replacing all occurances of xyz with hal9000 and replacing all occurances of Xyz with Hal9000
• Write the missing code for the methods in each class.
• Add any additional classes required such as classes for the instructions of the HAL9000 system.
• Edit the Makefile file to add the additional classes.
• Edit the scale/backend/Makefile file to add the hal9000 directory.
• Compile the classes in the directory.

You can test this backend by using -arch hal9000 as a parameter to the Scale compiler.

Note - all the current code generators are for RISC-style architectures. There may be existing assumptions in the base classes in scale/backend that assume that the architecture is byte-addressable and that the architeture follows load/operate/store model. It may be difficult to develop code generators for word-addressable systems and CISC-style systems.