Java Reference
In-Depth Information
processing and when applied to the AST nodes representing the executable
parts of the program.
In the design of the
methods, two goals were paramount. The first
was that the operation of each method must be based on only the AST node
with which it is associated and information supplied by processing the sub-
trees it references, while avoiding any dependency on the structure of any
surrounding parts of the AST. The second principle was that checking must
produce clear error messages so that a programmer can easily identify the
program error that produced any particular message. The notion of using an
errorType to deal with type errors was presented. Use of this technique in a
consistent way throughout the
visit
ective way to minimize
the number of error messages generated by the compiler, thus highlighting
problems more precisely for the programmer.
visit
methods is an e
ff
