Files in the MUDC compiler and what they do:

lex.l		- Processed by lex (the lexical analyzer generator) to
			produce lex.yy.c (C source code).

lex.yy.c	- The product of lex and lex.l, but included since the
			the lexical analyzer rarely needs changing in distributions.

yacc.y		- The context free grammar and stubs for MUDC language.
			Processed by yacc to produce yacc.tab.c, which is C source
			code for the LALR parser. Embedded in yacc.y is the
			logic for constructing the parse tree for the input
			stream. The parse tree is then passed to the code
			generator (emit.c) which uses syntax directed translation
			to output MUDASM. After MUDASM, you are in Artur's
			territory. :)

sym.h,
sym.c		- C source for symbol table utilities.

parse.h,
parse.c		- C source for parse tree utilities.

emit.c		- MUDASM generator, traverses the parse tree built by
			the LALR parser and emits MUDASM based on syntax
			rules, and symbol table types, etc.


  [ LEXICAL ANALYZER ]   <- GET_TOKEN() -> [ LALR PARSER ]
                                                 |
                                           [ EMIT_ASM() ]


Don't modify lex.yy.c or yacc.tab.c directly, unless there is some
bug which keeps your C compiler from compiling it. To work on the
compiler, get flex and bison (lex and yacc are probably already
installed) and work from lex.l and yacc.y.