Digital Equipment Corporation

Dennis Joseph Murphy

Robert Neil Faiman, Jr

A compiler framework uses a generic 'shell' and a generic back end (where the code generator is target-specific). The generic back end provides the functions of optimization, register and memory allocation, and code generation. The code generation function of the back end may be targeted for any of a number of computer architectures. A front end is tailored for each different source language, such as Cobol, Fortran, Pascal, C, C++, etc. The front end scans and parses the source code modules, and generates from them an intermediate language representation of the source code programs expressed in the source code. The intermediate language represents any of the source code languages in a universal manner, so the interface between the front end and back end is of a standard format, and need not be rewritten for each language-specific front end. A feature is the type definition (TD) mechanism, referred to a the TD module. This module provides mechanisms used by the front end and the compiler of the back end in constructing program 'type-information' to be incorporated in an object module for use by a linker or debugger. The creation of 'type-information' takes place in the context of symbol table creation and allows a front end to specify to the back end an abstract representation of program type information. The TD module provides service routines that allow a front end to describe basic types and abstract types.

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Westford, MA, United States of America

Dennis Joseph Murphy