Project-1 related :
syntax.y     : bison file
lexical.l    : flex file
error.c      : error handling
cst.h/c      : concrete syntax tree
Project-2 related :
rastack.h    : a random access stack templete
semantic.h/c : semantic analysis
sym.h/c      : id attribute & symbol table
type.h/c     : type system
Others:
defs.h       : type variable define etc.
decls.h      : functions declaration
main.c       : main function