Abstract:

In this article we propose a method for quickly constructing an assembler, The method has the following features： it uses lex and yacc to generate the lexer and parser of an assembler respectively; an instruction exists as an internal representation in the assembler; the instructions＇ encoding infor rmation is saved in the data tables, when encoding an instruction a generic procedure is employed to search these tables to decide on its encoding forma t, and then a corresponding encoding function is called to produce its machine code. An assembler constructed using this method is easily modifiable. Fi nally we describe the application of this method when implementing a VLIW DSP＇ assembler.

Key words: assembler, construction, VLIW