Processor Description Languages

144 CHAPTER 6 EXPRESSION: An ADL for Software Toolkit Generation

■ Base Components Library: This library is the core of SIMPRESS. It defines

each of the four component types in EXPRESSION (unit, storage, port, con-

nection) as a class in the library. All other component types are derived from

one of these classes. These four base classes define the public interface that

governs the interaction between various components.

■ Target Components Library: This library contains a description of each

component class (derived from the base component classes) that is target

specific (e.g., ALU, buses, etc). This library captures the functionality of the

individual ...